- Shape-univ - cosmo.torun.pl

--- SPAM --- Nov, 16 deafen
by Ronny 16 Nov '06

16 Nov '06

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Ah-ah-ah-ah-ah... Straight'nin' the curve, flat'nin' the hills. Treacle pudding, fish and chips, fizzy drinks and liquorice, flowers, rivers, sand and sea, snowflakes and the stars are free. Birds taught me to sing, when they took me to their king, first I had to fly, in the sky so high so high, so high so high so high, so - if you want to sing this way, think of what you'd like to say, add a tune and you will see, just how easy it can be. Do-do-do-do, Cities of Gold. He's goin' everywhere, B.J. This is my boss, Jonathan Hart, a self-made millionaire, he's quite a guy. wishing for The Cities of Gold. If you have a problem and no one else can help, and if you can find them, maybe y Spam detection software, running on the system "galileo.astro.uni.torun.pl", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or block similar future email. If you have any questions, see postmaster for details. Content preview: ------=_NextPart_002_11B8_01C70976.7D5E2020 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable He's got style, a groovy style, and a car that just won't stop. Hong Kong Phooey, quicker than the human eye. Rollin' down to Dallas, who's providin' my palace, off to New Orleans or who knows where. McKay and this is my best friend Bear. There's a voice that keeps on calling me. But when I end up in the hay it's only hay, hey hey. Places new and ladies, too, I'm B.J. wishing for The Cities of Gold. Hong Kong Phooey, quicker than the human eye. Knight Rider, a shadowy flight into the dangerous world of a man who does not exist. Round, all around the world. Can't stay for long, just turn around and I'm gone again. Treacle pudding, fish and chips, fizzy drinks and liquorice, flowers, rivers, sand and sea, snowflakes and the stars are free. Today, still wanted by the government, they survive as soldiers of fortune. Ah-ah-ah-ah-ah... It's true I hire my body out for pay, hey hey. Can't stay for long, just turn around and I'm gone again. He's the boss, he's a pip, he's the championship. Straight'nin' the curve, flat'nin' the hills. Top Cat! The most effectual Top Cat! Who's intellectual close friends get to call him T.C., providing it's with dignity. Places new and ladies, too, I'm B.J. Just the good ol' boys, never meanin' no harm. One for all and all for one, Muskehounds are always ready. When the going gets tough, he's really rough, with a Hong Kong Phooey chop (Hi-Ya!). Straight'nin' the curve, flat'nin' the hills. Ulysses, Ulysses - Fighting evil and tyranny, with all his power, and with all of his might. He just keeps on movin', ladies keep improvin', every day is better than the last. Howwww! Nab him, jab him, tab him, grab him, stop that pigeon now. Thunder, thunder, thundercats, Ho! Thundercats are on the move, Thundercats are loose. He's the boss, he's a pip, he's the championship. When courage is needed, you're never around. Hong Kong Phooey, quicker than the human eye. Knight Rider, a shadowy flight into the dangerous world of a man who does not exist. Ah-ah-ah-ah-ah... Straight'nin' the curve, flat'nin' [...] Content analysis details: (5.8 points, 4.5 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.3 HTML_FONTCOLOR_UNKNOWN BODY: HTML font color is unknown to us 0.1 HTML_MESSAGE BODY: HTML included in message 5.4 BAYES_99 BODY: Bayesian spam probability is 99 to 100% [score: 1.0000]

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finding a room + computer projector for 16:00 piatek @instytut fizyki
by Boud Roukema 02 Nov '06

02 Nov '06

Hi Piotr (Peplowski), Who should i contact to make a regular room + computer projector reservation for a wyklad monograficzny lecture? We need to shift from Piwnice because of my linux courses - the monograph students agreed to the shift, and our guess is that friday afternoon should not be difficult for finding a room at I.Fizyki. What is needed: * room (small is OK, max 10 people) * computer projector * when: each Friday (piatek) 16:00-18:00 * topic: Shape of the Universe - wyklad monograficzny * someone who can confirm to us that this is OK Sorry that this request is at the "last minute"... pozdr boud

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wyklad monog: ksztalt wszechswiata: piatek 16.00g @KRA 27.10.06
by Boud Roukema 24 Oct '06

24 Oct '06

Cześć wszystkim, Po rozmowę z kilka doktorantami, wybieraliśmy piątek o 16.00g jako dzień/godzina dla wykłada monograficznego ,,Kształt Wszechświata" tym semestr. Piątek 27.10.2006r. będzie w KRA (chyba potem będzie w IFizyki). Wszysce interesowane, proszę się zapisywać na shape-univ: http://cosmo.torun.pl/mailman/listinfo/shape-univ i może też się rejestrować na twiki: http://cosmo.torun.pl/Cosmo/MonographCosmo i przypominać co już znasz (czy nie znasz) o kosmologii. Jak zwykle, nadzieje jest, aby część wykład będzie pracę na prawdziwę badanie. pozdr boud

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by Freda Dailey 27 Jun '06

27 Jun '06

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I lvoe you!
by Errol Weaver 26 Jun '06

26 Jun '06

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CMB/WMAP constraints on alpha
by blew 16 Jun '06

16 Jun '06

Witam, So, getting back to alpha, there is a nice paper with a nice intrduction with summary on fine structure constant evolution from variety of experiments (see refs.) and using WMAP 1st yr data they constrain alpha by it's impact on recombination rate and hence power spectrum here it is: http://arxiv.org/ps/astro-ph/0602577 pozdr. Bartek

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DM review
by blew 15 Jun '06

15 Jun '06

Hello Agnieszka, shape-univ Maybe it's a bit off tipic of the list but here is a nice review paper on DM if you're interested. http://arxiv.org/abs/astro-ph/0605719 Comments: Not yet externally reviewed - not for quotation A study of the current status of WIMP dark matter searches has been made in the context of scientific and technical planning for a Deep Underground Science and Engineering Laboratory (DUSEL) in the U.S. The table of contents follows: 1. Overview 2. WIMP Dark Matter: Cosmology, Astrophysics, and Particle Physics 3. Direct Detection of WIMPs 4. Indirect Detection of WIMPs 5. Dark Matter Candidates and New Physics in the Laboratory 6. Synergies with Other Sub-Fields 7. Direct Detection Experiments: Status and Future Prospects 8. Infrastructure 9. International Context 10. Summary and Outlook 11. Acknowledgements despite of the unapealing "comments" fileld :p there is a large scientific group behind :) pozrd. BL

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INTEGRAL/SPI: first 511keV-photograph of dark matter halo?
by Boud Roukema 09 Jun '06

09 Jun '06

witam Kn\"odlseder et al. (2005) seems to be the main "discovery" article of the INTEGRAL/SPI results. It has some very nice pictures - especially Figs 4, 5 and 7 - here i've put the closed links, but the figures are in the astro-ph versions too, of course: Fig 4 http://www.edpsciences.org/articles/aa/full/2005/38/aa2063-04/img62.gif Fig 5 http://www.edpsciences.org/articles/aa/full/2005/38/aa2063-04/img63.gif Fig 7 http://www.edpsciences.org/articles/aa/full/2005/38/aa2063-04/img108.gif We may soon be able to say that Fig.~4 was the "first picture of invisible matter" ;). Ascasibar et al 2005 has some very interesting conclusions - apart from the continued validity of LDM as only (so far) viable explanation, they say: > One consequence is that the value of the fine structure constant \alpha > should differ from that recommended in the CODATA (Committee on Data > for Science and Technology). This is a very strong test for the LDM > scenario and an additional motivation in favour of experiments > measuring \alpha directly. Our results finally indicate that an accurate > measurement of the shape of the dark halo profile could have a > tremendous impact on the determination of the origin of the 511-keV > line and vice versa. Both of these are very good for showing that evidence should build up either for or against the LDM hypothesis. :) pozdr boud Kn\"odlseder et al. (2005) http://arXiv.org/abs/astro-ph/0506026 http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?bibcode=2005A%26A...441..5… Ascasibar, Y et al. (2005) http://arXiv.org/abs/astro-ph/0507142 http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?bibcode=2006MNRAS.368.1695…

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07 Jun '06

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Re: [Shape-univ] Re: loose thoughts on topology and nongaussianity
by blew 05 Jun '06

05 Jun '06

Well this sure was really hard week with fluid mechanics and stuff but now eventually back to cosmology Hi Boud, shape-univ >> >> If we assumed some multiply-connected space-time within some model (eg. >> dodecahedral) then my question is whether is leads to nongaussian (NG) >> features in CMB. I think it definitely should. > > In principle, yes. In practice, maybe. > >> Such spacetime, gives a modified power spectrum of fluctuations, limited to >> fundamental domain size and there should be repercusions of this size >> in harmonic modes that are natural multiple of that size. Then given a feature >> at one length scale should automatically give features at other scales - >> hence vialation of gaussianity. This could be investigated by bi- or >> tri-spectrum optimalized for these particular perturbation modes that come >> from the model. Given NG simulations one could estimate the sensityvity of >> this approach. >> This is also a test of the multiply connected space hypothesis. >> >> Is that right ? > > In principle, yes. > > Hajian & Souradeep (2006) measure the bispectrum from several different > version of WMAP-1st-year and claim no significant deviations from gaussianity: > http://arxiv.org/abs/astro-ph/0501001 This is definitelly interesting paper. They deal with tests od SI violation and what are possible sources of such violation - eg. nonuniform sky noice. This is of particular interest to me recently since, I was calculating the variance (related to power spectrum amplidute) in separate region on the sky of WMAP and clearly I see nonuniform pattern of even with small scale signal removed. So I don;t quite understand that no strong IS violation was found, unless they mean the primordial SI is not viiolated after accounting for non-uniform noice in the map. BTW. they calculate Bipolar power spectrum, NOT bispectrum IMHO. and where is it about gaussianity ? are you talking about astro-ph/0501001 ? well maybye a bit but they sure don't test it. > > But they don't model the *expected* signature of the PDS (poincare dodecahedral > space) in 0501001. > > In Hajian & Souradeep (2003), they model the expected signature from various > specific versions of the T^3 model: > http://arxiv.org/abs/astro-ph/0301590 again, this is not about the bispectrum. In any case with BiPS it's not possible to detect NG (non-Gaussainity), now is it ? it's on;y a measure of SI. I guess what I've jsut said above about their lack of detection is correct in light of what they say in conclusions of this paper. The question is whether it will ever be possible give such an answer. Meaning that is we knew what comes from noice, then why simply not to remove if from the map and then make a SI tests. If this is not possible then all that will be possible is to give comments like "it remains unprooved that the SI violation is of primordial origin". especially when there is not spectral dependence. However, in 0501001 I guess that they filtered the maps before analysis strongly removing anything for l>100. At such large scales the nonuniform noice distribution shouldn't be important at all. This is probably why they didn't find any SI violation at these scales. > > i've only looked at this quickly, but it seems that they do not necessarily > expect a strong (or any non-zero) signal. > > In any case, back in 2003, there was little discussion of the PDS - the paper > is dated 11 Aug 2003, and the Luminet et al. paper came out around Oct 2003. > Hmmm... i guess at least, there was no pressure for them to study PDS. :P > > > So working out what bispectrum is expected from the PDS has (maybe) not been > done yet. well, this was only a loose thought. calculating bispectrum involves calculating alm compontnts first which involves technics that are generally as much CPU consuming as calculating bispectrum itself (because of the 3J symbols) - i'm not ready yet to do that with my soft :( > > Hmm: better check the Aurich, Lustig, Steiner and Gundermann papers - they > might have tried this. > > >> What I would need is to have a full fourier space of perturbations with >> topology encoded in it. > > The PDS is a positive curvature model: you can't do fourier analysis in curved that's true generally. (but it's ok to do it in flat sky approx. - i.e. for large k or l) > space. You need the full set of eigenmodes of the PDS itself. and that's more less what I've said. i need \Phi(kx,ky,kz) for PDS topology aren't these the eigen-modes in topology nomenclature ? > > Tarou-san has done lots of cosmic topology eigenmode modelling - if > you want to do something like this, you might want to visit him: > > Kaiki Taro Inoue > kinoue phys kindai ac jp > :) one of these days, one of these days :) > > Or maybe your idea is more like making simulations, then making > measurements of the bispectrum parameters, and then comparing them to > the analytical calculations in Hajian & Souradeep (2003)? Hmmm... well, > this would only function as a check that HS2003 have not made any errors. > > But then you could presumably think of something new and interesting > as a followup step - you can add stuff to simulations which can be (in > some sense) difficult to add to analytical calculations. > I have to stick with NG I guess not SI. however there is so much independent sources of NG... my primary target is to deal with NG as an one of the observales (currently achievable) to constrain inflationary models. But seems to me that also A ans n_s and tensors are of very high competitive interest. I'm not yet sure which of these are better way of doing that, sure they are independent and NG will continoue to be sexy in cosmology for many years. :) BUT... since topo-stuff can also be a source of NG - which is primordial - so it surly is within my interest. pozdr. Bartek

2 1

Re: Re:
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04 Jun '06

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loose thoughts on topology and nongaussianity
by blew 22 May '06

22 May '06

Hi Boud, I've just had such a though. If we assumed some multiply-connected space-time within some model (eg. dodecahedral) then my question is whether is leads to nongaussian (NG) features in CMB. I think it definitely should. Such spacetime, gives a modified power spectrum of fluctuations, limited to fundamental domain size and there should be repercusions of this size in harmonic modes that are natural multiple of that size. Then given a feature at one length scale should automatically give features at other scales - hence vialation of gaussianity. This could be investigated by bi- or tri-spectrum optimalized for these particular perturbation modes that come from the model. Given NG simulations one could estimate the sensityvity of this approach. This is also a test of the multiply connected space hypothesis. Is that right ? What I would need is to have a full fourier space of perturbations with topology encoded in it. pozdr. Bartek

2 1

Cosmo/LicMagTematy
by Boud Roukema 13 Mar '06

13 Mar '06

Witam Andrzej, wszystkich, Andrzej Strobel asked for licencjat/magisterki themes. So i've slightly updated http://cosmo.torun.pl/cgi-bin/twiki/view/Cosmo/LicMagTematy Andrzej: below is my proposed text. pozdr boud ---------------------------------------------------------------------- Observational Cosmology Masters/Licencjat Project - General Outline Description: There are many possible projects which could be done as a master's thesis project, in using publicly available archival data from observational surveys to constrain one or more of the local or global cosmological parameters, either those related to shape (curvature, topology) or maybe also those unrelated to shape ("dark energy" or "dark matter"). The precise projects would be chosen in discussion with the masters/licencjat students. Please see http://cosmo.torun.pl/cgi-bin/twiki/view/Cosmo/CosmoProjects for projects that the cosmology group is working on and http://cosmo.torun.pl/cgi-bin/twiki/view/Cosmo/CosmoNews for ideas on the hottest topics in cosmology research - any of these would be appropriate if the student is sufficiently interested. Some examples are on http://cosmo.torun.pl/cgi-bin/twiki/view/Cosmo/LicMagTematy. General Requirements: * basic knowledge in astronomy, physics, mathematics, computing skills * desire to measure something about the shape of the Universe and/or dark matter or dark energy or other observational cosmology * willingness both to learn from and to teach others interested in observational cosmology at TCfA * willingness to learn the following practical skills: touch-typing, emacs, \LaTeX, usage of wikis and/or mailing lists for communication, GPL compatible programming * participation in the "Shape of the Universe" monograph course and/or Bronek Rudak's semester 9 "Kosmologia" course: o http://cosmo.torun.pl/cgi-bin/twiki/view/Cosmo/MonographCosmo o http://www.ncac.torun.pl/~bronek/KOS.html * Nie ma problemu jeśli student magistera lub licjencacki (jeszcze) nie dobrze mówi po angielsku, ale potrzeba znać czytać i rozumieć angielskie tekst, np na http://arXiv.org/ ----------------------------------------------------------------------

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moge byc spozniony jutro (czwartek 26.01.06) dla wykladu
by Boud Roukema 25 Jan '06

25 Jan '06

Cześć wszystkim (którzy uczestniczą w wykładzie tym semestr :) Pani z Działu Nauki w Rektoracie prosiła o poprawki (proste) do naszego wniosku o grant więc muszę rano iść przed wykładem jeszcze raz do Rektoratu... Mam nadzieje, że nie będę zapóźno, chyba z autobusem 10.00 tzn ok. 10.40 @Piwnice będzie ok. W czasie czekanie, mogłybyście tłumaczyć do sceptyków (humanistów?), że treść tu: http://pl.wikipedia.org/wiki/Kszta%C5%82t_Wszech%C5%9Bwiata jest dobra, lub to poprawić... Dyskusja jest (w zasadzie) tu: http://pl.wikipedia.org/wiki/Dyskusja:Kszta%C5%82t_Wszech%C5%9Bwiata Prośba o usunięcie strony jest tu: http://pl.wikipedia.org/wiki/Wikipedia:SDU/Kszta%C5%82t_Wszech%C5%9Bwiata Też lepiej rejestrować się (na góry, na prawo) przed edycji. do jutra boud

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ksztalt_Wszechswiata na pl.wikipedii: Strona do usuniecia!!!!!
by Boud Roukema 24 Jan '06

24 Jan '06

Witam shape-univ, Jest walka na wikipedii dotyczączy: http://pl.wikipedia.org/wiki/Kszta%C5%82t_Wszech%C5%9Bwiata Jest procedura glosowania do *usunięcia* strona!!!! http://pl.wikipedia.org/wiki/Wikipedia:SDU/Kszta%C5%82t_Wszech%C5%9Bwiata Dla głosować, musisz mieć minimum 100 edycji na pl.wikipedii - termin 31.01.2006. Dla dyskutować, nie musisz mieć żadnego ,,kredyt" edycyjnego. Wiem, że prawie wszysce jest zajęty z sesji, ale jeśli chcesz, że strona nie jest usunięta, proponuję, że uczestniczyć... Nie mówiłem tam że jestem dr.hab., bo to jest tylko ,,argument od autorytetu" zamiast argument naukowy. Dobry aspekt tego sprawy, jest, że więcej osoby w Polsce będą coś uczyć się o kosmologii... pod warunkiem, że zaangużujemy się w poprawkach... pozdr boud

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mirror matter debate
by Boud Roukema 03 Jan '06

03 Jan '06

Witam shape-univ, There are a few arguments here about "mirror matter (Foot et al.)" on the wikipedia: http://en.wikipedia.org/wiki/Talk:Mirror_matter i haven't gone into them deeply, but editing this page, or the article itself, might be one way to have more confidence in understanding the issue, since any changes or comments you make may be read by anyone else with internet access... A few comments *against* the Foot interpretation are at the level of what we might call "scientists' gossip" or rough intuition. The only serious response is to understand what Foot et al. says and also try to understand the comments. pozdr boud

1 1

reading matter - nonbaryonic dark matter
by Boud Roukema 30 Nov '05

30 Nov '05

Witam wszystkim na shape-univ, Mamy ktoś nowy, który interesuje się w kosmologii :) - Łukasz zaczyna licencjat o ciemnej materii - witam Łukasz :). Dodawałem nową sekcję do twiki: http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Cosmo/NonBaryonicDarkMa… Proszę popraw błędy, albo daj lepszy artykułow, itd. pozdr boud Review/Introduction papers on Non-Baryonic Dark Matter problem big-bang nucleosynthesis (BBN), e.g. Steigmann AstroPh:0511534 \Rightarrow \Omega_{nonbaryonic} \sim 0.25 WIMPS * AstroPh:0402045 Martin Rees - recent, quick and short * AstroPh:0506676 pages 5,6,7 Paul Frampton - recent, quantified, quick, short summary * AstroPh:0403064 Paul Gondolo - recent, in-depth introduction MACHOS * recent MACHO articles: http://arxiv.org/find/astro-ph/1/ti:+machos/0/1/0/all/0/1 * MACHO debate: are the MW microlensing events only due to known stellar populations? o Evans & Belokurov, 2004, RIP: The Macho Era (1974-2004) AstroPh:0411222 vs o Griest & Thomas 2004 Contamination in the MACHO dataset and the puzzle of LMC Microlensing AstroPh:0412443 brown dwarfs * brown dwarfs are baryonic: they cannot explain \Rightarrow \Omega_{nonbaryonic} \sim 0.25 pierwotny czarny dziury - primordial black holes * Afshordi et al. AstroPh:0302035 Primordial Black Holes as Dark Matter: The Power Spectrum and Evaporation of Early Structures

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bede kilka minuty spozniony dzis
by Boud Roukema 25 Nov '05

25 Nov '05

Przepraszam, trochę zadużo spałem dziś - idę do Piwnic z autobusem o 10.00g - tzn będę wykład od ok. 10.40g. pozdr boud

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CosmoPl meeting Jan/Feb 2006
by Boud Roukema 22 Nov '05

22 Nov '05

Cześć cosmo-spotka, Marek Biesiada from Katowice is interested in helping organise a small, informal 2-day cosmology meeting in Jan/Feb 2006. The main idea is to get together the different Polish cosmology people from Szczecin, Toruń, Kraków, Katowice, Lublin, Warsaw and hopefully maybe also some visitors from Czechy, Potsdam, Estonia, ... Anyway, here's the twiki page: http://cosmo.torun.pl/cgi-bin/twiki/view/Cosmo/CosmPlMeeting2006 Please join cosmo-spotka@ http://cosmo.torun.pl/mailman/listinfo/cosmo-spotka or else read the twiki page regularly if you're interested in helping organise (scientifically + locally) or participate in this meeting. Some time soon, we should send an invitation out to cosmo-pl@ - but IMHO we should keep cosmo-pl@ as a low volume list (many people are subscribed). Anyone interested in this meeting should join cosmo-spotka. pozdr boud

2 1

couple of comments on the pixelization schemes
by Bartosz Lew 10 Nov '05

10 Nov '05

Hi Boud, I've been wondering about the optimal pixelization scheme of the sphere a couple of weeks ago and since I've send to you my own implementation of the Healpix pixelization scheme written (generally) in C (according to astro-ph/0409533) but compatible with GNU c++ compiler here I'd like to comment on some comments that can be found in the source code. And since you don't like private, closed conversations I also cc this letter to shape-univ. 1) First of all healpix is not stupid :)))) - it's cool because pixels have the same area which is not always the case (e.g.. quad-cube pixelization used with COBE data), because it's hierarchical and isolatitude of course, however the first and the last features are also common in other pixelization schemes. 1.1) But also very important thing is that it is more less "equi-angular" - i.e. the angular distance from pixel to pixel is more less constant. But obviously the exact "equi-angular" solution does not exist. 2) Now the my CPEDS library for doing useful stuff - and especially the pixelization.c has more useful functions so probably I should update the version I've send to you. i.e. - conversions from RING to NESTED and vice versa - calculation of ring given pixel and vice versa (in both nested and ring orderings) - estimated pixel size (maybe not that useful) since it may be probably just as well estimated from 4PI/N_pix. 3) The main point I wanted to come up with the new idea for pixelization scheme was the thing I addressed in point 1.1. But also the following 3 drawbacks of this scheme, namely: 3.1) the pixel shape dramatically varies from pixel to pixel. this is what I didn't like because of e.g. CMB lensing studies where the morphology at small scales would be very important - but of course this can be overcome with sufficiently oversampling the pixelization by increasing the Nside parameter to meet the Nyquist conditions. 3.2) the number of pixels in a ring does NOT gradually rises with increasing \theta (in spherical system definition consistent with HEALPIX - i.e. theta = 0 at North pole). Instead it only rises in the top (bottom) part of the north (south) polar region. This is certainly unnatural thing. since all the latitudes in equatorial (roughly from 41 deg to 180-41 deg regions are represented by the same amount of pixels in longitude) !! This is not the case e.g.. in he GLESP (Gauss-Legendre) or Igloo pixelization schemes. 3.3) It has an axial symmetry (since it has a poles equator, rings, etc). And why the CMB sky should know anything about the symmetry ? In particular why should it have an axial symmetry ? So naturally the solution would evolve into direction of platonic forms like tetrahedron, cube, ... oops it ends at icosahedron. And since we need a pixelization with number of pixels something like few Mpixels the 20 pixels of icosahedron is not enough. My idea of tetrahedron based pixelization system was just driven from this point of view that there should be no preferred directions in the sky. The system would gain higher resolution by looking for directions equally separated from neighboring directions (initially defined by axis of tetrahedron). This concept fails, of course because such a solution does not exist. Max Tegmark also went in this direction inventing the icosahedron pixelization system which is the next step after the quad-cube system, but each triangle is divided in other way. Anyway, at this time I see no point of terrible importance to force the idea of the tetrahedron pixelization system so I drop this case. rather it would be interesting to implement other pixelizations systems into the isolat packet. pozdr, Bartek

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wyklad 10.00g piatek 28.10.2005
by Boud Roukema 26 Oct '05

26 Oct '05

Witam, Będzie wykład monograficzny pojutro o 10.00g @KRA. pozdr boud

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ksztalt wszechswiata - monograf 2005/2006 zima
by Boud Roukema 06 Oct '05

06 Oct '05

Cześć Andrzej (Strobel), Proponuję to jako kilka zdanie dotyczący monograf. pozdr boud ---------------------------------------------------------------------- Kształt Wszechświata - Shape of the Universe Monograf dotyczy kształt Wszechświata według standardowych modelu ciepłego Wielki Wybuchu (model zbieżności), tzn jego krzywizna i jego topologia, w aspektach teoretycznych i obserwacyjnych. Linki polecane: http://pl.wikipedia.org/wiki/Ksztalt_Wszechswiata This monograph deals with the shape of the Universe according to the standard hot Big Bang model (convergence model), i.e. its curvature and topology, including both theoretical and observational aspects. Recommended links: http://en.wikipedia.org/wiki/Shape_of_the_universe ----------------------------------------------------------------------

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wikipedia - ogolna uwaga - forma zapodanych definicji:)
by Bartosz Lew 14 Jun '05

14 Jun '05

wlasnie widzialem http://pl.wikipedia.org/wiki/Brakuj%B1ca_materia IMHO, definicje rzeczy umieszczana na wikipedia powinny nasladowac taka forma jaka jest przyjeta w normalnych encyklopediach. I nie powinnos sie stowowas sformuowan typu "nie wiem co by bylo" itp. ---- ------^ jesli juz czegos nie wiadomo to lepiwj uzyc "nie wiadomo" albo nie jest jasne albo cos takiego. pozdrawiam. Bartek

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egzamin ksztalt wsz'a - wyk monog - punkty na twiki
by Boud Roukema 13 Jun '05

13 Jun '05

Witam, Chyba jeszcze są osoby, którze chcą ,,egzamin" dla wykładu monograficznego Kształt Wszechświata tym semestr - wtedy proszę daj mnie - i innych - trochę czas żeby weryfikować twoje 5 punkty na twiki! Nawet jeśli inny studenci (czy pracowników) nic nie poprawiają na twoich stronach twiki, to nie znaczy, że nikt nie to czyta :). Więc warto pokazywać, że zrobiłeś coś interesujący, i pokazuje, że rozumiesz coś o kosmologii. W każdym bądź razie, Andrzej Czarny już ma jej strona przygotowa: http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Main/AndrzejCzarny Możesz dać komentarze, poprawić - ale oczywiście, Andrzej też będzie mogł poprawić twoja strona też... :) Więc chyba warto że twoje komentarze są konstruktywne. Andrzej (Cz) - już dałem kilka komentarze. Dotyczączy twoje strony na wikipedii, uważam, że cel wikipedii nie jest tworzony wiele strony niezależny o prawie sam idei - jeśli dwa pojęcie są prawie sam, lepiej zrobić mała poprawka, czy dodawać sekcja, do istniejąca strona niż tworzyć nową. W każdym bądź razie, lepiej dyskutujemy w sposób modularnym :) - tzn że komentarze są na stronach twiki i wikipedii. pozdr boud

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0.1.17 - phase of best match (generalised from -36, 0, +36)
by Boud Roukema 16 Feb '05

16 Feb '05

Witam, http://cosmo.torun.pl/GPLdownload/dodec/circles-0.1.17.tar.gz jest przygotowy. Mo�esz u�ywa� opcja -D �eby produkowa� wykresy i wtedy najintersuj�ce s� gs s_rot_*[tf].ps Pokazuj� S i \sigma dla rozwi�zanie w astro-ph/0402608, oko�o tych 6 okr�gi, ale zamiast tylko fazy -36.0 deg, 0.0 deg i +36.0 deg, jest dla -36.0 deg + beta gdzie beta jest faza miedzy 0 i 360 deg. Je�li hypoteza jest dobra, musi by� maksimum S na 0 i minimum \sigma na 0 deg. Wydaje mi si� �e jest to prawda: maks S i min \sigma s� na 0 deg. Oczywi�cie, to nie *wystarczy* pokazywa� �e hypoteza jest dobra, ale najmniej jest to sp�jny. s_rot_stat.ps -> S s_rot_diff.ps -> \sigma BTW, tu jest program warsztatu w Pary�u - Bartek i ja b�dziemy tam. pozdr boud ----------------------------------------------------------------------------= ---------------------------------------------------------------------- Workshop "Cosmic Topology between WMAP and PLANCK : Facts and Theories" Observatoire de Paris-Meudon, CIAS 8-10 march 2005 Preliminary Program Tuesday 8 March : Topology and CMB 10.00 - J.-P. Luminet : Opening address - Cosmic topology, New Challenges 10.45 - Coffee break 11.00 - G. Starkman : Looking for the topology=20 of the universe using circles in the sky 11.45 - B. Roukema : The Poincar=E9 dodecahedral=20 manifold and matched circles in the first-year=20 WMAP ILC data 12.30 - Discussion and Lunch 14.30 - S. Lustig: CMB Anisotropy of Spherical Spaces 15.15 - A. Riazuelo : The State-of-the-Art of CMB=20 simulations in multiconnected spaces. 16.00 - Coffee Break 16.15 - F. Steiner: CMB Anisotropy of Hyperbolic Spaces 17.00 - General Discussion Wednesday 9 March. Mathematical Methods for Multiconnected Spaces. 10.00 - J. Weeks : Mathematics of Multipoles - Ideas New and Old 10.45 - Coffee break 11.00 - M. Lachieze-Rey : A few remarks on Multipole Vectors 11.45 - J . Gundermann : Eigenmodes in spherical=20 spaces, the case of S3, S3/I*, S3/T* and S3/O*. 12.30 - Discussion and Lunch 14.30 - M. Lachieze-Rey : Mathematical methods=20 for eigenmodes in spherical spaces 15.15 - S. Caillerie : Computation of eigenmodes=20 in Spherical Dodecahedral Space 16.00 - Coffee Break and Discussion Thursday 10 March. Crystallography and Other Methods. Open Discussion. 10.00 - M. Reboucas : title to come 10.45 - Coffee break 11.00 - G. Starkman : The statistical isotropy=20 of the microwave background, or is the low-l=20 microwave background really cosmic? 11.45 - B. Lew : Tests of non-gaussian features=20 of CMBR in WMAP map as hints for non trivial=20 topology 12.30 - Discussion and Lunch 14.30 - B. Roukema : Cosmic crystallography using=20 short-lived objects - active galactic nuclei 15.15 - A. Riazuelo : CMB Polarization in multiconnected spaces. 16.00 - Final Discussion ----------------------------------------------------------------------------= ----------------------------------------------------------------------

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fascist's stuff !!!! -- Your message to Shape-univ awaits moderator approval (fwd)
by Boud Roukema 14 Feb '05

14 Feb '05

Cze¶æ shape-univ, Oko³o tygodniu temu, ilo¶æ spam do shape-univ zosta³ d³u¿szy ni¿ wcze¶niej. (Byæ mo¿e kto¶ pisa³ adres listy w formacie dla spiderów, tzn z @ zamiast z " at " lub " w " lub z "ANTISPAM" lub co¶tam?) Wcze¶niej, parametry listy by³y ¿e *ktokolwiek* z mejlem w ¶wiecie mog³ wysy³aæ mejl bezpo¶rednie na listy, tylko by³oby analizowany przez spamassassin. Teraz, je¶li kto¶ wysy³a mejla od *adresa*, który nie jest zapisany na li¶cie, bêdzie traktowany jak listy od kto¶ nie zapisany, i bêdzie czekaæ dla moderatora. Konkretnie, w version 2.0.11 mailmana, opcja jest: Restrict posting privilege to list members? (member_posting_only) (Details) No Yes Teraz jest "Yes". Mogliby¶my wróciæ do "No", ale wtedy by³oby wiêcej spam (w weekendzie byli 3). Co mo¿esz zrobiæ je¶li masz rozmaity adresy, (np kto¶@astro..., kto¶@astri, kto¶(a)wp.pl, ...), jest zapisaæ siê pod wszystki adresy, http://cosmo.torun.pl/mailman/listinfo/shape-univ Subscribing to Shape-univ Subscribe to Shape-univ by filling out the following form. You will be sent email requesting confirmation, i musisz potwierdziæ, wtedy i¶æ na dolu http://cosmo.torun.pl/mailman/listinfo/shape-univ To change your subscription (set options like digest and delivery modes, get a reminder of your password, or unsubscribe from Shape-univ), either enter your subscription email address: i kliknij na "Edit options" i wtedy zrób: Disable mail delivery Turn this on if you want mail to not be delivered to you for a little while. dla ca³y (oprócz jeden) z twoich adresy. Wtedy bêdziesz otrzymaæ tylko jedna kopia ka¿da mejla na listê (inaczej bêdziesz mieæ pod ka¿dym adresie). pozdr boud > ---------- Forwarded message ---------- > Date: Mon, 14 Feb 2005 10:35:18 +0100 (MET) > From: ****** <******* at astro.uni.torun.pl> > To: Boud Roukema <boud at astro.uni.torun.pl> > Subject: fascist's stuff !!!! -- Your message to Shape-univ awaits > moderator approval (fwd) > > > why is this fascist's stuff is holding me back ? :) Cieszê siê ¿e u¿ytkowniki nie toleruj± cokolwiek cenzury od adminów ;). > ---------- Forwarded message ---------- > Date: Mon, 14 Feb 2005 10:31:01 +0100 > From: shape-univ-admin at cosmo.torun.pl > To: ******* at astro.uni.torun.pl > Subject: Your message to Shape-univ awaits moderator approval > > Your mail to 'Shape-univ' with the subject > > ************ > > Is being held until the list moderator can review it for approval. > > The reason it is being held: > > Post by non-member to a members-only list > > Either the message will get posted to the list, or you will receive > notification of the moderator's decision. >

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bleee 20th hour
by Bartosz Lew 14 Feb '05

14 Feb '05

czesc Boud. Listen if you want to move in to 36 I think I would be good idea you talk to Marek Gleba if he has some switch because there is only one inet cable so it won't do for us two. eemmm, I'm about to finish my own versio of a program that calculates circles on the sky for dodecahedron. :) I was just wandering about the correlator you used. I have 2 remarks: 1) circles of different sizes are represented by different number of pixels. so naturally bigger circles will have bigger S value that the smaller because there is just simply more terms to sum over. like T_i*T_j from 'upper' and 'lower' circle. I'm trying to use the same correlator but normalized to one pixes - i.e. I divide each S value (for each individual circle) by the number of pixels that go into it. What do you think about that ? 2) I'm a bit worried about the fact that you don't use absolue values in the \delta T_i and \delta T_j. Imagine a fluctuations aroud the circle in shape of just a linear function T(dist_along_circle=d) ~ d and indentical in the opposite circle. whaen you correlate this you get zero - that's not much. I know it's not a prove but looks a bit worrying to me,since probably some , any random fluctuations can generate S > 0, while for the perfect match we get S=0. So I indent to use abs(T_i)*abs(T_j) (except from the normalization thing). at the moment the program don't work yet - still debuging :/ pozdr. Bart

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Delivery service mail
by Shapells 02 Feb '05

02 Feb '05

WARNING: This e-mail has been altered by MIMEDefang. Following this paragraph are indications of the actual changes made. For more information about your site's MIMEDefang policy, contact Andrzej Marecki <postmaster@localhost>. For more information about MIMEDefang, see: http://www.roaringpenguin.com/mimedefang/enduser.php3 An attachment named upd02.cpl was removed from this document as it constituted a security hazard. If you require this document, please contact the sender and arrange an alternate means of receiving it.

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Re: tesing dodec
by Boud Roukema 01 Feb '05

01 Feb '05

Witam, > If you think this could be interesting to others you can reply or cc > your opinion on shape-univ. Pewnie jest to interesujący dla shape-univ! :) Daję odpowiedź chyba niedługi... pozdr boud On Sat, 29 Jan 2005, Bartosz Lew wrote: > > Czesc Boud. > > I have a new idea. > I've just compiled the healpix soft and generated a map from > previously calculated power spectrum from new cmbfast package. > > eg. see > http://adjani.astro.uni.torun.pl/~blew/praca/topology/moj-l04-08-anim.gif > or if it's too slow moj-l04-08-anim2.gif :)) > > I was just thinking about that tast of significance of the signal > you've found and what you said that this is a lot of work doesn's seem > to be right to me now. well imagine I provide you a new simulated > map. in fits format for standard LCDM WMAP model in WMAP resolution > and pixelisation scheme. you put this through you pileline for dodec just > to see > what comes out. the rms signal or peak-to-peak dispersion would define > the valid detection threshold for the real map. isn't that right ? > > it doesn't matter that the simulation is performed for simply > connected space. - even better. in fact it's similar as doing the same > thing but on the realmap but with nonphysical case of zero rotation. > > I'll try to do it tommorow on my own with your package if I'll manage > to find out how it works and compile it correctly. > > what do you think. of couser to treat this seriously I must pay more > attention to noise thing in each pixel, size of beam etc but as I > remember I read some good publication about this stuff recently so > perhaps this isn't big problem. > > the bigger problem could possibly arise when I'd like to simulate the > map for some non-trivial topology to get some strong signal in a shape > of spikes in circles correlation function, like cornish et al. did. > > If you think this could be interesting to others you can reply or cc > your opinion on shape-univ. > > bartek > >

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topology vs inflation --- back to study :)
by Bartosz Lew 23 Jan '05

23 Jan '05

hi everybody. here I present an argument which I've just come to. the basic question is: is the compact topology consistent with the inflation. my argument point out that there is a chance that the answer could be not necessarily :) well, one of the prominent predictions of the compact topology is that the power spectrum of fluctuations should have a cut off at some topological size scale since the size of the fluctuations must fit into the the finite size of the fundamental polyhedron. eg. some wavenumber k and some related with it distance - corresponding to some eigenmode of the gravitational potential must be smaller than the size of the fundamental domain. On the other hand the inflation predicts that the eigenmodes of the gravitational fluctuations are independent from scale and yield gaussian distribution. this is inconsistent with the compact topology idea, isn't it ? what do you think about it, Boud, anybody ? pozdrawiam, Bartek

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circles-0.1.13.tar.gz; projekt pauliny/cezary
by Boud Roukema 19 Jan '05

19 Jan '05

Witam, http://cosmo.torun.pl/GPLdownload/dodec/circles-0.1.13.tar.gz ma kilka poprawki od wcześniejszych wersji: - jeszcze potrzeba około 60Mb pamięci (RAM+swap?), ale jest zrobiony u C zamiast u fortran, więc raczej niż ,,naruszenie ochrony pamięci", chyba tylko będziesz mieć problem jeśli *prawdziwie* brakuje pamięci - jest przykład funkcja lib/newdat.c dla projekt Pauliny/Cezary: http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Main/SymulacjaWMAP zobacz ChangeLog dla więcej szczególy. Ostatnie formalny wykład tej sobotę 22.01.2005r. o 11.30g jak zwykle. Oprócz Paulina i Cezary, chyba nikt nie zapisał jego punkty na twiki. Moim skromnym zdaniem, nie ma sens używać metodę punkty-na-twiki jeśli nie ma minimum czas między propozycję punkty i moment podpisy na indeks. Jak myślecie o minimum 1 miesiąc między propozycjami punkty i podpisem? Bo inaczej, jeden z najważniejszy powód pisać na twiki straci sens: nikt nie może, w praktyce, dać komentarze jeśli nie ma wystarczający czas. Do osób chętne dla próby inne metody niż twiki, zapraszam na moodle: http://planck.astro.uni.torun.pl/moodle ale uważaj, jeszcze nie jest pełnie instalowany, i jeszcze nie widzę gdzie lub czy są najważniejsze ,,narzędzie" uczenie się w tego pakietu. Być może są, tylko jeszczse nie widziałem. pozdr boud

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PKO BP i PZU Wycena i Prywaty-zacja
by Rafal Mazurkiewicz 10 Jan '05

10 Jan '05

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wyklad jutro !!! i co robiliscie ?
by Boud Roukema 07 Jan '05

07 Jan '05

Witam shape-univ zimo 2004/2005, Nie widziałem co zrobiliście na wiki!!! Metoda egzamin na wiki tylko może funkcjonować jeśli jest komunikacja ogólnie między studentami, nie tylko że osób będą indywidualnie ja pytać na ostatnio minut czy *ja* sam akceptuje ich punkty. Musi być czas żeby nie tylko ja będzie uzasadnić istotność i treści punktów, moim skromnym zdaniem. http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Cosmo/MonographCosmo Dla osób, które zapomniali: cel jest zrobić następny krok na pytanie: ,,Czy już wiemy kształt Wszechświata lub nie?" Już circles-0.1.11.tar.gz jest przygotowy. Jest AM_MAINTAINER_MODE w configure.ac żeby instalacja na (np) sun.astri musi być spokojnie nawet że wersja automake jest różny od wersji automake że używałem dla przygotowanie pakietu. Jeśli ktoś chce używać autoconf/automake itd dla własnej wersja circles'a, na krok configure, musiałbyś zrobić ./configure --prefix=<moja_kategoria> --enable-maintainer-mode i wtedy będziesz ,,maintainer"-em. Piszucie co byli twoje pomysł, pytanie, plany, co rozumiałeś, co nie rozumiałeś, jaki błędy są w programie, itd itd.... Nikt może decydować dla siebie na pytaniach *badania* - jeśli odpowiedź już jest pewna, to nie badania, to tylko weryfikacja. do jutra boud

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8 stycznia - wyklad monog - ksztalt wszechswiata?
by Boud Roukema 06 Jan '05

06 Jan '05

Cześć Michał (Hanasz), Jak są plany dla twoje wykłady monograficzne? Czy możemy zrobić wykład kosmologiczny tej sobotę 8.I.2005r lub czy jest konflikt z MHD? I jak są plany dla 15.I i 22.I - czy możemy zrobić kosmologii też o 22.I ? pozdr boud

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PROPOZYCJA 8 + 22 stycznia 2005 - TERMIN DECYZJI 16g piat 17.XII
by Boud Roukema 15 Dec '04

15 Dec '04

Witam, Michał Hanasz proponuje że zrobimy naszy wykład monograficzny (Kształt Wszechświata): 08 stycznia 2005r. + 22 stycniad 2005r. (Jego wykład będzie 15 stycznia, jeśli zgadzamy się.) Proponuję 16g piątek jak termin decyzyjny konsensualny, tzn że jeśli nikt mówi że jest przeciwko przed 16g piątek, propozyjca jest akceptowany. Oczywiście, jeśli jest problem, najlepiej byłoby dać lepiej propozycję... pozdr boud PS: Michał i Tomek, które byli pierwszy raz przedwczoraj nie są na tej lista mejla, ani (jeszcze) na twiki, wydaje mi się. Proponuję że jeśli ktoś ma kontakt z imi, proszę pomagaj ich z komunikacji - mogą oni zapisuj się i na twiki ("Register"), i na shape-univ: http://cosmo.torun.pl/mailman/listinfo/shape-univ "Subscribing to Shape-univ"

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wykl mono jutro sob 11.XII.2004r. :)
by Boud Roukema 10 Dec '04

10 Dec '04

Przypominam: http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Cosmo/MonographCosmo Próbuję przygotowąc pakiet ,,circles" dla jutro... Widziemy... na jutrze boud

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Cosmic crystallography revisited
by Andrzej Marecki 09 Dec '04

09 Dec '04

Dear All, I would like to point your attention to.... ----------------------------------------------------------------------------- Paper: astro-ph/0412181 Date: Wed, 8 Dec 2004 09:33:19 GMT (154kb) Title: Cosmic crystallography using short-lived objects - active galactic nuclei Authors: Andrzej Marecki (1), Boudewijn F. Roukema (1), Stanis\law Bajtlik (2) ((1) Toru\'n Centre for Astronomy, N. Copernicus University, Toru\'n, (2) N. Copernicus Astronomical Centre, Warsaw) Comments: 8 pages, 6 figures, to appear in Astronomy & Astrophysics \\ ----------------------------------------------------------------------------- This paper has got a very positive report from the A&A referee and after introducing one enhancement will be resubmitted and then very likely accepted for publication in Astronomy & Astrophysics. However, if you like to make a comment on this preprint you are very welcome! Best regards, Andrzej Marecki ----------------------------------------------------------------------------- Andrzej Marecki | Torun Centre for Astronomy | e-mail: amr(a)astro.uni.torun.pl N. Copernicus University | WWW: http://www.astro.uni.torun.pl ul. Gagarina 11 | tel: +48 56 6113032 PL-87-100 Torun, POLAND | fax: +48 56 6113009 -----------------------------------------------------------------------------

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W sprawie przesuniecia terminu wykladu
by brodzinski＠astri.uni.torun.pl 22 Nov '04

22 Nov '04

Witam! Chcialbym zapytac, czy jest mozliwosc przeniesienia najblizszego wykladu majacego sie planowo odbyc w sobote 27 listop. na inny termin np. na niedziele tydzien pozniej tj. 5.12 (nie proponuje soboty, bo tego dnia dr M.Hanasz prowadzi zajecia i by kolidowalo). Przyczyna jest taka ze 27 listop. nie moglbym uczestniczyc w wykladzie a nie chcialbym tracic zajec zwlaszcza ze razem maja byc tylko 4 spotkania na caly semestr, prosilbym wiec o zyczliwe odniesienie sie do mojej prosby. Jezeli chodzi o osoby z mojego roku to wszyscy sluchacze sie zgadzaja, pozostaje jeszcze zgoda prowadzacego wyklad dr B.Roukemy oraz pozostalych uczestnikow. Prosze o (mozliwie szybka) odpowiedz. Pozdrawiam Wojciech Brodzinski

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shape-univ monograph: 27 November + 11 December
by Boud Roukema 08 Nov '04

08 Nov '04

hi Michał, Apparently your wykład monograficzny will be 20 November and Saturday each two weeks following that. We chose Sat 27 November and Sat 11 December for our next two wykłąd monograficzny on the shape of the Universe. Are these dates OK so that our lectures do not conflict? We probably will not have a problem with the computer room - 5 students turned up Sat 6 November - but at least one student wants to participate in both lectures, so it would be best to avoid having both lectures at the same time. pozdr boud

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witam do shape-univ :)
by Boud Roukema 08 Nov '04

08 Nov '04

Witam do studentów z nowego pokolenia wykład monograficzny o kształt wszechświata :) Mamy stron twiki: http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Cosmo/MonographCosmo (Łukasz, Andrzej, i Andrzej - proszę zróbicie ,,Register" jeśli chcecie 5 punkty dla egzamin... Wcześniej że używacie twiki i piszucie twoje cele, propozycji punkty, wcześniej inne studenci będziemy motywane. Też ja mogę łatwiejszy dać komentarze tylko jeśli jest komunikacji od was...) I też ma grupa dyskusyjna: http://cosmo.torun.pl/mailman/listinfo/shape-univ Jest to standardowa grupa mailmana. Tzn, np że osób mniej interesowane lub które mają mniej czas zagadać o kształt Wszechświata, mogą wypisać się od grupy, bez interewencji admina, albo na stron www: http://cosmo.torun.pl/mailman/listinfo/shape-univ albo chyba też jest info na dolę tej listy (np z pinem jest info dla unsubscrib-ować się). Więc nie boisz się spamował: jeśli masz meta-pytania (gdzie znaleźć więcej informacji o X, dlaczego jest błęd w artykuł Y, ...), pytaj! Też możesz weryfikować kto jest zapisany, chodź do http://cosmo.torun.pl/mailman/listinfo/shape-univ i do "visit subscriber list". If you want to practise English, of course you can write in English... pozdr boud

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sobota 6 listopada 2004r @KRA 11.30g-17.30g
by Boud Roukema 04 Nov '04

04 Nov '04

Witam, (Przepraszam dla spamowanie - proponuję że na pierszwy wykłady, wszyscy interesowany zapisuj się na listę shape-univ...) Pierwszy wykład monograficzny ,,Kształt Wszechświata" pojutrze: http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Cosmo/MonographCosmo sobota 6 listopada 2004r @KRA 11.30g-17.30g autobus 10.45g kierunek Chełmno, przystanek 6 pozdr boud

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lecture + computer room @Fizyki Monday 12.00-14.00g please?
by Boud Roukema 22 Oct '04

22 Oct '04

Hi Andrzej (Strobel), I'm trying to find a day/time suitable for III/IV/V year students in astronomy for my monograph course - http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Cosmo/MonographCosmo At the moment it seems that Monday 12.00-14.00g would be suitable for everyone, but it would have to be in Wydział Fizyki. Is it likely that for the first few weeks (3-4 weeks) a normal lecture room, at least with blackboard/whiteboard would be available at this time for about 10-15 students, and preferably with access to a computer projector? From about end November/first week of December, we would need access to a room with unix/linux computers, where the students can ssh to Piwnice or work locally as they wish (and install GNU GPL compatible programs :). pozdr boud PS: i tried telephoning you on x3005 but there was no answer. Email really makes communication a lot easier IMHO once people start using it.

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free lecture and computer room @Fizyki Monday 15.00-17.00g ?
by Boud Roukema 20 Oct '04

20 Oct '04

Hi Piotr, I'm trying to find a day/time suitable for III/IV/V year students in astronomy for my monograph course - http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Cosmo/MonographCosmo At the moment it seems like Monday 15.00-17.00g would be suitable for everyone, but it would have to be in Wydział Fizyki. (Alternatively, if the IIIroku students can shift their course with J Hirsch on classical mechanics - scheduled in sala 23, 17.00-19.00g in the draft program, e.g. to 18.30-20.30 ???, http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Cosmo/TeachingZimo20042… then all the students could come to Piwnice with the 15.30g bus and return with the 18.00 bus.) Is it likely that for the first few weeks (3-4 weeks) a normal lecture room, at least with blackboard/whiteboard would be available at this time for about 3-10 students (maybe more, but probably not), and preferably with access to a computer projector?

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Was Einstein right about dark energy after all?
by Andrzej Marecki 24 Feb '04

24 Feb '04

NEWSALERT: Monday, February 23, 2004 @ 1548 GMT --------------------------------------------------------------------- The latest news from Astronomy Now and Spaceflight Now WAS EINSTEIN RIGHT ABOUT DARK ENERGY AFTER ALL? ----------------------------------------------- The good news from NASA's Hubble Space Telescope is that Einstein was right -- maybe. A strange form of energy called "dark energy" is looking a little more like the repulsive force that Einstein theorized in an attempt to balance the universe against its own gravity. Even if Einstein turns out to be wrong, the universe's dark energy probably won't destroy the universe any sooner than about 30 billion years from now, say Hubble researchers. http://spaceflightnow.com/news/n0402/21darkenergy/

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bbn reloaded
by Bartosz Lew 13 Feb '04

13 Feb '04

"Solving the Crisis in Big-Bang Nucleosynthesis by the Radiative Decay of an Exotic Particle" Erich Holtmann1,2, Masahiro Kawasaki3, and Takeo Moroi2 1Department of Physics, University of California, Berkeley, California 94720 2Theoretical Physics Group, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 3Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan Received 6 March 1996 We discuss a new mechanism which can solve the crisis in standard big-bang nucleosynthesis. A long-lived particle X (104 sec <~ tau X <~ 106 sec) which decays into photon(s) will induce cascade photons, and destroy significant amounts of D and 3He without destroying 4He or too much 7Li. We numerically investigate this process and derive a constraint on the properties of X such that the theoretical values of the primordial light-element abundances agree with observation. We also present some candidates for the unstable particle X. Phys. Rev. Lett. 77, 3712?3715 (1996) [Issue 18 ? 28 October 1996 ] -------- well, I didn't read the whole thing but this sounds a bit discouraging. It seems that BBN mae not that "stable" as everybody belives. Maeybe there is still something missing in there, and yet all cosmo society dumb belive in so-called bbn constraint on Omega_b*h^2... maeybe in library there will be the whole thing. bart.

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None
by Bartosz Lew 07 Jan '04

07 Jan '04

ok, maeybe I messed something up ;) but the bottomline still is that UCD are very cuspy ;) but what's with their halo - something that the host galaxy was involved that's all I know here's the article astro-ph/0307362 bart. ps. if ths came to you twice - sorry for that

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dark matter constraints: Soutenance de these (fwd)
by boud 09 Dec '03

09 Dec '03

witam, Here are some hints on indirect DM searches (Bartek is specially interested in this). b > ---------- Forwarded message ---------- > Date: Tue, 9 Dec 2003 21:18:35 +0100 (MET) > From: Gianfranco Bertone <bertone(a)iap.fr> > To: users_all at iap.fr > Subject: Soutenance de these > > > Bonjour, > > vous etes cordialement invites a ma soutenance de > these, qui aura lieu le Mardi 16 Decembre 2003 a 15h, dans > l'amphitheatre de l'Institut d'Astrophysique de Paris, ainsi > qu'au pot qui suivra. > > Cordialement, > > Gf > > ******************************************************* > TITLE > High Energy Astrophysics: Indirect Detection of Dark Matter > and Propagation of Ultra-High Energy Heavy Nuclei > > ABSTRACT > We discuss the prospects of indirect detection of Dark Matter > through its annihilation radiation in the Galactic halo, under > the assumption that it is made of weakly interactive massive > particles (WIMPs) and focusing in particular on specific candidates > such as the supersymmetric neutralino, the lightest Kaluza-Klein > particle in scenarios with unified extra-dimensions, and on generic > super-heavy candidates. > > We consider three channels of the annihilation flux from the Galactic > center: synchrotron radiation, gamma-ray and neutrino flux. > Using the present observations we are able to put constraints on > the physical parameters of Dark Matter particles and distribution, > while the expected sensitivity of future experiments allows us > to discuss the prospects of observing Dark Matter candidates in the > near future. We also study the possibility of using stellar > structure arguments and helioseismic observations to constrain > the properties of \DM particles. > > In the second part we discuss the propagation of ultra-high energy > heavy nuclei in an extra-galactic magnetic field, keeping into account > all relevant energy losses. We then study numerically such process > and use the results of simulations to analyze different models for the > origin of ultra-high energy cosmic rays recently appeared in literature. > > ****************************************************** > > -- > Gianfranco BERTONE > Institut d'Astrophysique de Paris > 98bis Bd Arago 75014 Paris > Tel.: +33 (0) 1 44 32 81 90 > Fax.: +33 (0) 1 44 32 80 01 > web: http://www.iap.fr/users/bertone

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disk space for students
by Boud Roukema 04 Dec '03

04 Dec '03

Hi Krzyszek, Would you be able to provide the students (at least those in my monograph course: http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Cosmo/MonographCosmo ) with some scratch space, e.g. on /home4/scratch which seems to have (at the moment) about 26 Gb free? E.g. 100Mb or so. By "scratch space", i mean space where it is clear that any files there will *not* be backed up, and there could either be a rule that files will be automatically deleted there at, e.g. the beginning of each month, or else just set a quota of 100Mb or whatever. The most active students' usernames are: grzenow lenka rwiatr and the others can ask later if they really want the space. thanks boud

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a new plaything for cosmology
by Bartosz Lew 25 Nov '03

25 Nov '03

enjoy :) http://adjani.astro.uni.torun.pl/~blew/praca/calc/index.html any comments, bugs-finds, etc appreciated. pozdrawiam, bart

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gas question
by Bartosz Lew 24 Nov '03

24 Nov '03

this might be a bit off topic but still interesting... Is it correct that intergalactinc gas, made of relativistic electrons, seen in X-rays by bremstrahlung rediation caused by collisions with DM particles, comes originally from galaxies, where the electrons are accelerated in galactic magnetic fields and SN explosions and then some of them escape the galactic grawitation ? bartek

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