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176 discussions

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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