Cosmo-torun

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328 discussions

PROPOSAL for a decision-making method for new computer V0.01
by Boud Roukema 08 Oct '02

08 Oct '02

Witam wszystkim, A computer has been bought for the TCfA cosmology group! :) This is a big investment and I would like to try to apply modern management methods - specifically, consensus decision-making techniques - for deciding on how to use and run it, rather than just one or two people deciding. Please comment, criticise this proposal. (If you think it's fundamentally against what we are here for, you could argue to veto the proposal itself!) Next message: concrete proposals for the machine. boud ########## PROPOSAL for a decision-making method V0.01 ################## First, a reminder on the AIM of our group: * research and education-leading-to-research in observational cosmology * Second, background reading on what consensus is and why it's effective: flow chart: http://www.consensus.net/flowchart.html word description: http://www.consensus.net/ocac2.html Third, a simplified consensus method: DEFINITION: "anyone" is defined here as undergrad students, masters/PhD students, postdocs or faculty studying or teaching at TCfA/CAMK-Toru� in cosmology related fields. (I will put a proposal for "cafe+" type meetings on http://www.astro.uni.torun.pl/sympa/cosmo-spotka/2002-10/ soon...) PROPOSALS: WHO - anyone (the proposer) can make a proposal for use of the computer, but hopefully it should be someone willing to do the work once the decision is made! HOW - the proposal is made on the most appropriate mailing list, e.g. cosmo-torun HOW - anyone can make comments, constructive criticisms, to try to improve the proposal HOW - the proposer writes successive versions of the proposal based on the comments DECISION - after discussion seems to have converged, the proposer (or other moderator) sends an email to the same list with Subject: PROPOSAL <name of proposal> DEADLINE FOR COMMENTS/VETO <deadline>, where the deadline is X days after the date of the email. X = 2 if the decision is essentially a matter of taste X = 7 if the decision is more serious X = 1 if there is some unexpected really urgent decision to be made STEPPING ASIDE - anyone who is against the proposal, but accepts that his/her criticisms have been listened to and are not important enough for a veto, can "step aside", and these criticisms are added to the proposal. This way, others are aware of the (claimed) weak points. VETO - anyone can veto the decision, but only based on the aim of our group (see AIM: above), i.e. not for trivial reasons. He/she should explain the reason for the veto. #######################################################################

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Is DE related to CDM?
by Boud Roukema 01 Oct '02

01 Oct '02

Witam What if DE (dark energy) is not something from early universe physics but instead is directly related to the properties of the CDM (cold dark matter) particles as some sort of negative pressure? Two articles on this idea: http://de.arXiv.org/abs/astro-ph/0209584 Schwartz http://de.arXiv.org/abs/hep-ph/0209322 Gondolo \& Freese (Varun Sahni et al. had some ideas earlier - last 12-18 months - on how DE and non-baryonic DM could be the same thing, but I think it was just phenomenological. Though I'm not sure.) pozd boud

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Fwd: U Chi: Microwave Background Announcement (fwd)
by boud 26 Sep '02

26 Sep '02

CMB polarization discovered? Notice how the journalist manages to convert: "it's in line with theoretical predictions." into a much stronger statement: > verifies the theoretical framework that supports modern cosmological > theory. But i guess the DASI people will need to struggle to get as much media attention as MAP... i haven't followed the debate on CMB polarization, so i don't know how seriously a detection can constrain any models. Maybe Micha� F has done some reading on this...? pozdrawiam boud > ---------- Forwarded message ---------- > Date: Thu, 19 Sep 2002 16:26:58 -0400 (EDT) > From: David Spergel <dns@... > To: all(a)astro.Princeton.EDU > Subject: Fwd: U Chi: Microwave Background Announcement (fwd) ... >**This material was sent earlier under embargo to reporters and the >embargo having expired, is now sent to press officers.** > >THE FOLLOWING RELEASE WAS RECEIVED FROM THE UNIVERSITY OF CHICAGO, >IN ILLINOIS, AND IS FORWARDED FOR YOUR INFORMATION. (FORWARDING >DOES NOT IMPLY ENDORSEMENT BY THE AMERICAN ASTRONOMICAL SOCIETY.) >Steve Maran, American Astronomical Society > >September 19, 2002 >Contact: Steve Koppes >773-702-8366 >E-mail: s-koppes(a)uchicago.edu > >Discovery supports astronomers' >paradoxical views of the universe > >The universe really is as surprising as scientists have come to >suspect it is, according to a discovery that University of Chicago >astrophysicists will announce Thursday, Sept. 19, at the COSMO-02 >conference at Adler Planetarium and Astronomy Museum. The discovery, >which astrophysicists have pursued with increasingly sensitive >instruments for more than two decades, verifies the theoretical >framework that supports modern cosmological theory. > >Using a radio telescope called the Degree Angular Scale >Interferometer (DASI) at the National Science Foundation's >Amundsen-Scott South Pole Station, the Chicago scientists measured >the minute polarization of the cosmic microwave background, the >sky-pervading afterglow of the big bang. > >Most light is unpolarized, its many individual waves jumbled >together, each wave flickering up and down in a different plane as it >speeds toward Earth. Unpolarized light becomes polarized whenever it >is reflected or scattered. This is the principle behind polarizing >sunglasses that remove the glare from the hood of a car or the >surface of a pool. In both cases the sunglasses only permit waves >that tend to flicker up and down in the same plane to pass. > >The polarization of the cosmic microwave background was produced by >the scattering of cosmic light when it last interacted with matter, >nearly 14 billion years ago. If no polarization had been found, >astrophysicists would have to reject all their interpretations of the >remarkable data they have compiled in recent years, said John >Carlstrom, the S. Chandrasekhar Distinguished Service Professor in >Astronomy & Astrophysics at the University of Chicago. > >"Instead of stating that we think we really understand the origin and >evolution of the universe with high confidence, we would be saying >that we just don't know," said Carlstrom, who will announce the >discovery. "Polarization is predicted. It's been detected and it's in >line with theoretical predictions. We're stuck with this preposterous >universe." > >It's a universe in which ordinary matter, the stuff of which humans, >stars and galaxies are made, accounts for less than five percent of >the universe's total mass and energy. The vast majority of the >universe, meanwhile, is made of a mysterious force that astronomers >call "dark energy." This vague name reflects the fact that scientists >simply do not know what it is. They only know that it acts in >opposition to gravity, accelerating the expansion of the universe. > >In addition to the dark energy theory, cosmic inflation theory >improbably proposes that the universe underwent a gigantic growth >spurt in a fraction of a second just moments after the big bang. > >"This beautiful framework of contemporary cosmology has many things >in it we don't understand, but we believe in the framework," said >Clem Pryke, Assistant Professor in Astronomy & Astrophysics at the >University of Chicago and a member of the DASI team. "This new result >was a crucial test for the framework to pass." > >Carlstrom's other collaborators on the polarization discovery were >John Kovac and Erik Leitch, University of Chicago; and Nils Halverson >and Bill Holzapfel, University of California, Berkeley. > >The discovery follows in the wake of another important DASI finding. >Last year Carlstrom's team precisely measured temperature differences >in the cosmic microwave background, further supporting for the cosmic >inflation theory. > >The polarization signal is more than 10 times fainter than the >temperature differences that DASI detected earlier. DASI's first >discovery came after it collected data for 92 days from 32 spots in >the sky. But DASI needed to watch two spots in the sky for more than >200 days to detect the polarization. > >The discovery opens a new era in cosmic microwave background >experiments, said the Chicago astrophysicists. They predict that >increasingly sensitive detections of polarization will yield many >more discoveries. "It's going to triple the amount of information >that we get from the cosmic microwave background," said Kovac, a >Ph.D. student in Physics. "It's like going from the picture on a >black-and-white TV to color." > >The polarization is a signpost from when the universe was only >400,000 years old, when matter and energy were only just beginning to >separate from one another. "What's unique about polarization is that >it directly measures the dynamics in the early universe," Carlstrom >said. > >Temperature differences revealed patterns of lumpy matter frozen in >the early universe, but by measuring polarization, astronomers can >actually see how the early universe was moving. > >In the coming years, astronomers will attempt to use the CMB >polarization to measure gravity waves, a form of radiation predicted >by general relativity that corresponds to ripples in the fabric of >space-time, said Michael Turner, the Bruce and Diana Rauner >Distinguished Service Professor in Astronomy & Astrophysics at the >University of Chicago. > >"Detection of the polarization opens a new door to exploring the >earliest moments and answering the deep questions before us," Turner >said. > ### >sk/02-79 > >------------------------------------------------------------------ >IF YOU DO NOT WISH TO CONTINUE RECEIVING PRESS RELEASES THAT ARE >FORWARDED TO THE NEWS MEDIA VIA THE AMERICAN ASTRONOMICAL SOCIETY, >PLEASE REPLY ACCORDINGLY TO ANY INCOMING PRESS RELEASE, OR WRITE >TO hrsmaran(a)eclair.gsfc.nasa.gov. Requests for referrals to experts >should be sent to the same address.

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How the Universe got its Spots [if it has them]
by Boud Roukema 02 Sep '02

02 Sep '02

Cze�� cosmo-torun list, There was one positive comment and zero negative comments on my book proposition: http://www.astro.uni.torun.pl/sympa/cosmo-torun/2002-08/msg00003.html so i'll ask for this to be ordered. :) Cze�� Karolina, Could we please order the following cosmology book for the TCfA library? http://pup.princeton.edu/titles/7324.html > How the Universe Got Its Spots: > Diary of a Finite Time in a Finite Space > Janna Levin > Cloth | 2002 | $22.95 / ?15.95 | ISBN: 0-691-09657-0 > 224 pp. | 6 x 9 | 68 line illus. Thanks boud

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another cosmology book?
by Boud Roukema 19 Aug '02

19 Aug '02

Hi everyone, Sorry if the method of deciding and ordering library books on cosmology was a little confusing - I'm still learning about how things work here, so I take any blame which is due. A bunch of books has been ordered, and most have arrived, and Karolina and I will try to make up a list of these to help guide students and anyone else interested. Anyway, I just saw that a book has come out by one of the main people in observational cosmic topology work (Janna Levin): http://pup.princeton.edu/titles/7324.html > How the Universe Got Its Spots: > Diary of a Finite Time in a Finite Space > Janna Levin > Cloth | 2002 | $22.95 / ?15.95 | ISBN: 0-691-09657-0 > 224 pp. | 6 x 9 | 68 line illus. Why I think we should buy this: * The level of difficulty is for the common reader, but I think this should be a good motivational book, and good for bringing students up to "state-of-the-art" cosmology. * Also, most of the books we have say almost nothing on the global shape of the Universe. * There also seems to be a selection effect in the cosmology books we have so far: 50% of the population is unrepresented, and since the number of introductory cosmology books we have is something like a dozen or so, having zero introductory books by women is about 3-4 sigma inconsistent with unbiased selection. Could anyone with comments please provide them within a week or so? This way, there would be a chance of having the book not too long after students start in October-ish... Cze�� Boud

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wt/sr 20/21 sierpnia 14:00 sala budynku radio
by Boud Roukema 16 Aug '02

16 Aug '02

Cze�� wszystkim, Wprowadzenie do kosmlogii do studenci od Krak�w/Z.G�ra wtorek 20 sierpnia 14:00 �roda 21 sierpnia 14:00 wyk�adowca: boud (cosmo-torun(a)astro.uni.torun.pl) studenci: praktyki(a)astri.uni.torun.pl Witam wszystko! dla ostatnia informacja: http://www.astro.uni.torun.pl/sympa/cosmo-torun/

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strony kosmologii w TCfA
by Boud Roukema 09 Aug '02

09 Aug '02

Cze�� studenci z Krakowie/Zielona G�ra, Tu s� strony pracy kosmologia w TCfA: http://www.astro.uni.torun.pl/sympa/ Sugeruj� �e studenci prac*(a)astri.uni.torun.pl mog� tworzy� lista mejla z archiwem - tu jest przyk�ad archiw: http://www.astro.uni.torun.pl/sympa/cosmo-torun/2002-08/thrd1.html z *tej* mejlem, b�dzie: http://www.astro.uni.torun.pl/sympa/cosmo-torun/2002-08/msg00001.html - dla rozmawia� o jak uczy� si� o astronomia, gdzie s� dobre sajta internecie dla jak my�le�cie jest interesuj�cy w astronomia, itd... Mo�liwe Krzysztof G (chris@astri...) mo�e pomaga� z programem "mailman" (jest jaki program "sympa"). Je�li chcescie �e robi� wyk�ad o kosmologi�, prosz� organizowajcie si� dni i czas (np w drugie p�lowie miesi�c, ale jak chce�cie). Pracuj� w pokoju #36 w budynku radio-owy. pozdrawiam boud

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studenci Krakow/ZG
by Boud Roukema 08 Aug '02

08 Aug '02

Cze�� Krzysztof, The students from Krak�w/�.G�ra will only officially start in the radio group during the second two weeks of their visit, but since once of the best ways they can learn about astronomy research - including cosmology research - includes learning how to find and analyse observational data, and this includes them talking to each other in and writing "reports" on their ideas, i asked Andrzej Strobel if it could be possible if you could give these students computer accounts right now, and from the radio group, we could help straight away by providing them a mailing list using the "sympa" robot, which would archive all of their email messages automatically in html files, like these: http://www.astro.uni.torun.pl/sympa/ In fact, one or two of the students could be the list manager(s), this can work perfectly OK even if they only have accounts on astri machines. (I think...) I would be happy to spend some time with them getting them started, but you'd need to tell me/them what disk usage is possible/reasonable. They could of course use the mailing list for discussing spectroscopy to start off with, and then radio stuff / cosmology later... It's up to them to take the initiative. Pozdrawiam Boud PS: This message will (hopefully ;) be publicly archived here: http://www.astro.uni.torun.pl/sympa/cosmo-torun/2002-08/thrd1.html

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urlop 29/07 - 02/08
by Boud Roukema 27 Jul '02

27 Jul '02

Cze�� wszystkim, B�dzi� w urlopu 29/07 - 02/08, w Hajn�wce przez �ubr�w... Na ra�e Boud

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test with 'resurrected' asterix
by Andrzej Marecki 27 Jun '02

27 Jun '02

Is this list being correctly archived now? This is not a trivial question - asterix (the machine that keeps the archives) has got a new disk & operating system. If you can read this message at: http://www.astro.uni.torun.pl/sympa/cosmo-torun/2002-06/thrd1.html - the answer is "yes, everything is OK". -- Andrzej

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