Cosmo-torun

cosmo-torun@cosmo.torun.pl

328 discussions

Start a nNew thread

test to cosmo-torun at cosmo.torun.pl
by Boud Roukema 30 Sep '04

30 Sep '04

1 0

the WMAP pixelisation algebra is free now :)
by Boud Roukema 23 Sep '04

23 Sep '04

Witam, Just one day before our deadline of 22 Sep, in response to our paper, the HEALPix people submitted a paper inspired by our work: http://de.arxiv.org/abs/astro-ph/0409513 So here's our version: http://de.arxiv.org/abs/astro-ph/0409547 The algebra is free (as in speech) now :). pozdr boud LISTNAME: cosmo-torun HELP: send an email to sympa(a)astro.uni.torun.pl with "help" WEB ARCHIVE: http://www.astro.uni.torun.pl/sympa/cosmo-torun/ UNSUBSCRIBE: email to sympa(a)astro.uni.torun.pl with "unsubscribe cosmo-torun"

1 1

Re: proposed co-authorship
by Boud Roukema 17 Sep '04

17 Sep '04

Hi Frode, Bartek, On Thu, 16 Sep 2004, Frode K. Hansen wrote: > > Dear Boud and Bartek > > > Please find attached the draft of a paper of which we invite you to > >be co-authors. > > > > Thank you for the invitation. I would be happy to participate as > co-author (who else is participating?) I'm not sure what the scope of > the paper is, if it is only the part which you have attached or if you > intend to include more stuff. As Kris already knows, I have a lot of > material for a paper which we started on some years ago but never > finished. This includes testing of the numerical precision of the > Healpix algorithms. If you intend to include this, I would be happy to > provide you with it (I still need to check that I have all of it after > all these years....). Great! For me it would be fine to have the paper in two parts: (1) the algebra of the pixelisation system (2) testing of numerical precision of the HEALPix software but let's hear what Bartek thinks. i should make it clear, to avoid any misunderstandings, that Kris and i have different points of view on different levels of freedom in software licencing issues (GNU GPL versus what Debian terms "non-free" licences), but IMHO there is no reason for this to be a problem with having both (1) and (2) in our paper. (1) The algebra is independent of any software at all, and (2) while personally i prefer GNU GPL, there are a huge number of cosmologists using the software under its present licence and it is clearly in their interests to be aware of numerical precision tests that have been done. Since you've done the work, and it's useful, it should be published. And there's no need to unnecessarily multiply the number of articles published (even if that helps with job committees, but i have a job now :). In that case we'll need a new title. How about something like this? "An algebraic derivation of the healpix pixelisation scheme and numerical precision of the HEALPix software" This way it clearly says that one bit is algebra, independent of any software, and the other bit is hands-on software stuff, useful to users of the software. Any better suggestions? We haven't heard back from any of the other people who seem to be "official" HEALPix collaborators (i didn't contact Tony Banday directly, because he requested not to receive emails from me - if you wish to contact him, please feel free to do so). Bartek: do you have any comments on including Frode's work in our paper? Cheers boud LISTNAME: cosmo-torun HELP: send an email to sympa(a)astro.uni.torun.pl with "help" WEB ARCHIVE: http://www.astro.uni.torun.pl/sympa/cosmo-torun/ UNSUBSCRIBE: email to sympa(a)astro.uni.torun.pl with "unsubscribe cosmo-torun"

1 0

proposed co-authorship
by Boud Roukema 08 Sep '04

08 Sep '04

Dear colleagues, Please find attached the draft of a paper of which we invite you to be co-authors. It is felt that the most consensual way to publish this paper would be to include the members of the HEALPix collaboration. We would be most happy to include your names as co-authors, if that is what you wish. However, if we hear nothing from you by Wednesday 22 September, then we will assume that you do not wish to be co-authors. Regards, Boud, Bartek LISTNAME: cosmo-torun HELP: send an email to sympa(a)astro.uni.torun.pl with "help" WEB ARCHIVE: http://www.astro.uni.torun.pl/sympa/cosmo-torun/ UNSUBSCRIBE: email to sympa(a)astro.uni.torun.pl with "unsubscribe cosmo-torun"

1 0

superluminal motions & H_0 - comments from Ajk - Bartek's IAP talk
by Boud Roukema 30 Aug '04

30 Aug '04

Witam wszyscy, Andrzej Kus is sceptical about using superluminal motions for estimating (local) cosmological parameters. Good :). Andrzej K - please correct me if i'm wrong, but what i understand of your arguments are something like: -> jets are bent, not systematically, nobody knows why, sometimes helical, very complex -> superluminal expansion speed is highly variable -> depends on which blobs are in which place, some blobs are fast, some are slow --> especially in mm data -> on month scale changes very rapidly - some blobs just stop for some time, and then start up again. My initial reaction is that in a statistical sample these should average out, provided that the errors are random and symmetrically distributed. Alternatively: can we try to statistically correct for this? Given that blobs stop and then start again, or change direction, but are only *detected* when they are moving superluminally, then it would seem to me that the true average speed is slower than estimated from the doppler factor. Most practical cosmology is about statistical corrections - it requires careful modelling and correct statistical analysis, but it can be done. Is it reasonable to use the observational data which *shows* the erratic behaviour of these objects to statistically model this? If yes, then we would have the necessary correction factor. Anyway, here's a link to Bartek's IAP talk: http://www2.iap.fr/Conferences/Colloque/col2004/Docs/20040629_Lew.pdf Andrzej K suggested that Bartek give a presentation on this (a Monday talk?) - seems a fine idea to me, and doesn't require much preparation from Bartek's side (except to take account of Andrzej's comments). pozdr boud LISTNAME: cosmo-torun HELP: send an email to sympa(a)astro.uni.torun.pl with "help" WEB ARCHIVE: http://www.astro.uni.torun.pl/sympa/cosmo-torun/ UNSUBSCRIBE: email to sympa(a)astro.uni.torun.pl with "unsubscribe cosmo-torun"

2 4

IAP CMB meeting talks online
by Boud Roukema 05 Jul '04

05 Jul '04

Witam, The IAP talks are available online: http://www2.iap.fr/Conferences/Colloque/col2004/program.html pozdr boud LISTNAME: cosmo-torun HELP: send an email to sympa(a)astro.uni.torun.pl with "help" WEB ARCHIVE: http://www.astro.uni.torun.pl/sympa/cosmo-torun/ UNSUBSCRIBE: email to sympa(a)astro.uni.torun.pl with "unsubscribe cosmo-torun"

1 0

Ciemna materia - seminarium (fwd)
by Boud Roukema 25 Jun '04

25 Jun '04

hi i'm sure there's an error in the date - it's probably Tue 29 June (not April) See http://adjani.astro.uni.torun.pl:9673/zwicky/CosmoNews for recent articles on dark matter. DAMA/NaI results interpreted as "Mirror matter" looks good to me: DM candidate: mirror matter http://arxiv.org/abs/astro-ph/0211067 - evidence for mirror matter from Eros??? - Foot, R. Mitra * http://arxiv.org/abs/astro-ph/0403043 - claim that mirror matter H' or He' halo with some O' better fits DAMA/NaI? energy spectrum than WIMPs? - Foot * http://arxiv.org/abs/hep-ph/0402267 - b to m from mirror matter implies ~1eV scale suggests relation to neutrino oscillations - Foot, Volkas poydr boud : ---------- Forwarded message ---------- : Date: Fri, 25 Jun 2004 09:55:56 +0200 : From: jiwanisz at phys.uni.torun.pl : To: staff at astri.uni.torun.pl, schmidt at ncac.torun.pl, : at phys.uni.torun.pl, Jacek Karwowski <jka at phys.uni.torun.pl> : Subject: Ciemna materia - seminarium Szanowni Panstwo, W najblizszy wtorek goscic bedziemy w Instytucie Fizyki prof. Leszka Roszkowskiego z Sheffield w Anglii. Jest on wybitnym specjalista pracujacym na pograniczu fizyki czastek elementarnych i astrofizyki (astroparticles). Zajmuje sie takze problemami dotyczacymi wysokich energii we Wszechswiecie oraz kosmologii. W trakcie swej wizyty, w ramach specjalnego Kolokwium Fizycznego, prof. Roszkowski wyglosi referat dotyczacy badan ciemnej materii. Poniewaz temat moze byc interesujacy dla Panstwa, dlatego przesylam o nim informacje i w imieniu kierownika Zakladu Mechaniki Kwantowej IF prof. Jacka Karwowskiego serdecznie na nie zapraszam. Lacze pozdrowienia, Jan Iwaniszewski %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% SPECJALNE KOLOKWIUM FIZYCZNE (Seminarium Zakładu Mechaniki Kwantowej) w dniu 29.04.2004 r. (wtorek) o godz. 12.15 w sali 20 Prof. Leszek ROSZKOWSKI (Department of Physics and Astronomy, University of Sheffield, Anglia) wygłosi referat pt.: PO CIEMNEJ STRONIE WSZECHŚWIATA %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% LISTNAME: cosmo-torun HELP: send an email to sympa(a)astro.uni.torun.pl with "help" WEB ARCHIVE: http://www.astro.uni.torun.pl/sympa/cosmo-torun/ UNSUBSCRIBE: email to sympa(a)astro.uni.torun.pl with "unsubscribe cosmo-torun"

1 0

gemoview
by Boud Roukema 08 Jun '04

08 Jun '04

witam, geomview has been installed on adjani. It's in principle good for interactively viewing 3D shapes in flat, spherical or hyperbolic space. There are example files but you probably need to understand the stuff about cameras, lighting etc in order to do something really useful. See file:///usr/share/doc/geomview/html/index.html for documentation. pozdr boud

1 0

paper formally accepted
by Boud Roukema 31 May '04

31 May '04

Hi, our topology paper has now been formally accepted by A&A. :) Hopefully there'll be some new stuff ready in a week or so to start thinking about the followup paper. pozdr boud

2 1

Whipple + CANGAROO-II - Re: DM from INTEGRAL satellite? - Rencontres Cosmologie-Astroparticule-Gravitation: Integral voit-il la matičre noire ? (fwd)
by Boud Roukema 26 May '04

26 May '04

Witam, Annihilating dark matter from TeV photons from Whipple + CANGAROO-II ? Or is it just from 3EG J1746-2851 (EGRET source)? This is from a much smaller length scale around the GC - a few tens of parsecs, *not* 1 kpc - compared to what seem to be the INTEGRAL results. http://arxiv.org/abs/astro-ph/0404205 Have Atmospheric Cerenkov Telescopes Observed Dark Matter? Authors: Dan Hooper, Ignacio de la Calle Perez, Joseph Silk, Francesc Ferrer, Subir Sarkar pozdr boud On Mon, 10 May 2004, boud wrote: > Discovery of dark matter by INTEGRAL? > > > ---------- Forwarded message ---------- > > Date: Mon, 10 May 2004 19:10:55 +0200 (MET DST) > > From: Luc Blanchet <blanchet at iap.fr> > > To: users_all at iap.fr > > Subject: [X-UNKNOWN] Rencontres Cosmologie-Astroparticule-Gravitation: > > Int[X-UNKNOWN] egral voit-il la matičre noire ? > > > > > > Nous vous annonçons la seconde édition des rencontres d'Ile de France : > > Cosmologie-Astroparticule-Gravitation: > > http://cdfinfo.in2p3.fr/~bouquet/CAG.html > > > > ======================================== > > le 18 mai 2004 de 14h ŕ 18h > > Amphithéâtre de l'Institut d'Astrophysique de Paris > > 98bis, Bd Arago - 75014 Paris > > ========================================= > > > > > > ============================ > > INTEGRAL voit-il la matičre noire ? > > ============================ > > Does INTEGRAL see dark matter? > > > > > Résumé: > > ------------ > > Les récentes observations menées par le satellite INTEGRAL dans le > > domaine des rayons gamma confirment l'émission d'un rayonnement > > d'annihilation de paires électrons-positrons extręmement intense dans > > les régions centrales de la Galaxie. La résolution angulaire et > > Recent INTEGRAL observations in gamma show very intense > electron-positron pair annihilation radiation in central regions of the > Galaxy. > > > spectrale sans précédent de ce satellite ont permis de caractériser le > > milieu dans lequel ont lieu ces annihilations et l'étendue spatiale des > > INTEGRAL has better angular resolution and spectral resolution than > earlier instruments/telescopes. > > > sources. Outre la trčs grande difficulté d'alimenter le centre > > galactique en positrons au taux requis par les observations, les > > modčles astrophysiques traditionnels se heurtent au problčme important > > de la distribution spatiale des sources de rayonnement, dont INTEGRAL a > > démontré qu'elles s'étendaient sur au moins 1 kpc autour du centre > > The sources are distributed up to at least 1 kpc from the G Centre - > which is difficult to explain from traditional astrophysical models. > > > galactique. Comment produire autant de positrons (10^43 s'annihilent > > chaque seconde !) et comment les disperser sur un aussi vaste volume ? > > How can so many (10^43) positrons annihilate per second? > How can they be distributed over such a large volume. > > > Un scénario faisant intervenir une composante légčre de matičre noire > > pourrait apporter une réponse simple et fascinante ŕ ces questions. > > One scenario is with a "light [non-heavy] component" of dark matter. > > > Alors, INTEGRAL voit-il la matičre noire du centre galactique? > > > > La demi-journée se déroulera comme suit : > > ---------------------------------------------------------- > > 14h00-14h40 : P. Jean (CESR-Toulouse) > > Observations de l'émission d'annihilation > > e+/e- galactique > > 14h45-15h25 : M. Cassé (IAP-Paris, CEA/Sap-Saclay) > > L'énigme des positrons du bulbe galactique : > > Hypernovae ou matičre noire légčre? > > 15h30-16h10 : C. Boehm (Oxford) > > Comment tester le scénario de matičre noire légčre ? > > 16h35-17h15 : D. Hooper (Oxford) > > Evidence for particle dark matter ? > > 17h20-18h00 : P. Fayet (ENS/LPT-Paris) > > Physique des particules et matičre noire légčre: > > une nouvelle interaction ? > > > > > > > > En espérant vous voir le 18 mai, > > > > Le comité d'organisation : L. Blanchet, A. Bouquet , Y. Giraud-Héraud, > > B. Guiderdoni, J.-Ch. Hamilton, E. Parizot

1 0

← Newer
1
...
16
17
18
19
20
21
22
...
33
Older →

Jump to page:

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

Cosmo-torun