Shape-univ March 2003

shape-univ@cosmo.torun.pl

7 participants
7 discussions

Matched circles on WMAP data
by Andrzej Marecki 27 Mar '03

27 Mar '03

Paper: astro-ph/0303580 From: Alain Riazuelo <riazuelo(a)spht.saclay.cea.fr> Date: Wed, 26 Mar 2003 17:20:20 GMT (641kb) Title: Cosmic microwave background constraints on multi-connected spherical spaces Authors: Jean-Philippe Uzan, Alain Riazuelo, Roland Lehoucq, Jeffrey Weeks Comments: 4 pages, submitted to PRL \\ This letter describes the Cosmic Microwave Background anisotropies of multi-connected spherical spaces in a closed universe with density parameter Omega_0 close to 1. [...] -- A.

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files,files,files
by szajtan odwieczny 20 Mar '03

20 Mar '03

hello everyone, Does anybody know theoreticaly how many files can there be on ext2 fs in one directory, on on fat32 filesystem in one directory ? bartek

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topology - WMAP
by Boud Roukema 19 Mar '03

19 Mar '03

Please follow the WMAP thread on cosmo-torun http://www.astro.uni.torun.pl/sympa/cosmo-torun/2003-03/msg00001.html Thanks boud

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Gazeta Wyborcza o odkryciu Tegmarka
by Andrzej Marecki 18 Mar '03

18 Mar '03

Artykuł o odkryciu ("odkryciu" ?) Tegmarka: http://www.gazeta.pl/nauka/1,34148,1376101.html Krytyka Marka Demiańskiego: http://www.gazeta.pl/nauka/1,34148,1376526.html -- Andrzej

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Re: map data
by szajtan odwieczny 18 Mar '03

18 Mar '03

I know this looks bad ;) and ... discouraging. But non of is comes from my code. I just ploted the data from internet - from lambda. They get a nice spectra because they bin it every 25 multipoles (on average), and as Boud noticed with some weight, which I have to chack. In this way we get that few point like in the first picture I sent but the errors become smaller. They also drop all data above l approx 600. Well there is no easy way out, and much to do. Now I'm also thinking about calculating the power spectra directly from the map from MAP. Any ideas with aid of what to do it ? (witting a new code I give up - from time reasons ) bart. oh btw. that "vast f90" you mentioned is also commercial now. On Mon, 17 Mar 2003, Michal Frackowiak wrote: > you must have missed something important.... it's more than a game of > "show the diffrences in 2 pictures". it's a game of "check your code and > do it again..." ;-) > > szajtan odwieczny wrote: > > >well this is the thing I've been talking about on last thursday. > >Look at these two pictures. ;) > >Maeybe this kind of analysion is useless but surely it shows what problem > >we are dealing with here. > >On my plot (green dots) I chop off all negative values, all the values > >above 10000 for > >multipoles greater that 300 (which isn't a big crime), and throw out all > >points of which "errorbars" were bigger that the values itself. > >The red dots are raw data as it goes from LAMBDA. > > > >Well perhaps (I hope ;) somewhere among green dots are those we see at the > >picture from NASA. > > > > > >bartek > > > > > > > > ------------------------------------------------------------------------ > > > >------------------------------------------------------------------------ > > > >LISTNAME: shape-univ > >HELP: send an email to sympa(a)astro.uni.torun.pl with "help" > >WEB ARCHIVE: http://www.astro.uni.torun.pl/sympa/shape-univ/ > >UNSUBSCRIBE: email to sympa(a)astro.uni.torun.pl with "unsubscribe shape-univ" > > > > > > > > >

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Re: new cmb code... (fwd)
by szajtan 17 Mar '03

17 Mar '03

ok. ciakawa koncepcja ale nie do konca rozumiem jak to dziala. masz obliczona i zparametryzowana (parametrami) w jakis sposob siatke modeli (o roznych parametrach kosmologicznych). tak ze na podstawie zadanych wartosci parametrow (nie kosmolog.) mozna szybko odtworzyc widmo. poszukiwane widmo w n wymiarowej przestrzeni parametrow jest otoczone przez 2^n modeli bazowych (o znanych zestawach wartosci parametrow kosmologicznych, i tych z parametryzacji). Mozna tez obliczyc jak daleko w przestrzeni parametrow kosmologicznych lezy poszukiwany model od modelow budujacych wezly siatki (tylko jak z tego skorzystac). Wiemy rowniez o ile roznia sie miedzy soba zestawy wartosci parametrow przypisanych do wezlow sieci. Ale nie chwytam kewstii obliczenia poszukiwanych wartosci parametrow na podstawie ktorych mozna odtworzyc widmo. Czyli innymi slowy jak to interpolowac skoro wiemy tylko ze poszukiwany zestaw parametrow lezy gdzies w oczku siatki parametrow.? > I have the code - not publicly available yet, but soon > it works as follows: > > 1. grid is produced and in nodes exact (well... cmbfast) cl spectrum is > calculated > 2. for every node some parametrisation of the spectrum is done (scaling, > chebyshev coeficients etc.) > 3. for given cosmo parms those parameters are interpolated and the > spectrum is reconstructed. > > quite simple. but faster than other interpolation methods (for gridded > models). > that is the main idea... > > polarisation also possible, but not yet implemented. > I can send you the code with the spectrum database if you wish. > > Bartosz Lew wrote: > > >ok, what's the catch ? > >and where is the code ? > > > >and btw. how this works ? > > > >On Mon, 17 Feb 2003, Michal Frackowiak wrote: > > > > > > > >>well, not completed, not even documented, but if anyone of you would > >>like to use it to reconstruct cmb spectrum REALLY FAST (within > >>miliseconds) - please try. > >>http://coyote.ncac.torun.pl/~michalf/cmbrecon/cmbrecon.php > >> > >>well - you can treat it as a preview of what is really about to happen. > >>a fast cmb-spectrum reconstruction code. with quintessence (or whatever) > >>included (soon also other scalar-tensor things). for generating grid: > >>server-client architecture, quite smart reconstruction algorithms.... > >>in case of interest/doubts/will to use - feel free to contact me. code > >>is quite complete and usable. > >> > >>michal frackowiak > >> > >> > >> > >> > >> > > > > > > > >------------------------------------------------------------------------ > > > >LISTNAME: shape-univ > >HELP: send an email to sympa(a)astro.uni.torun.pl with "help" > >WEB ARCHIVE: http://www.astro.uni.torun.pl/sympa/shape-univ/ > >UNSUBSCRIBE: email to sympa(a)astro.uni.torun.pl with "unsubscribe shape-univ" > > > > > > > > > > > > ---------------------------------------------------------------------------- ---- LISTNAME: shape-univ HELP: send an email to sympa(a)astro.uni.torun.pl with "help" WEB ARCHIVE: http://www.astro.uni.torun.pl/sympa/shape-univ/ UNSUBSCRIBE: email to sympa(a)astro.uni.torun.pl with "unsubscribe shape-univ" --------------r-e-k-l-a-m-a----------------- Tanie bilety lotnicze! http://samoloty.onet.pl

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map data
by szajtan odwieczny 15 Mar '03

15 Mar '03

well this is the thing I've been talking about on last thursday. Look at these two pictures. ;) Maeybe this kind of analysion is useless but surely it shows what problem we are dealing with here. On my plot (green dots) I chop off all negative values, all the values above 10000 for multipoles greater that 300 (which isn't a big crime), and throw out all points of which "errorbars" were bigger that the values itself. The red dots are raw data as it goes from LAMBDA. Well perhaps (I hope ;) somewhere among green dots are those we see at the picture from NASA. bartek

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Shape-univ March 2003