From blew w doktorant.umk.pl Sun Nov 4 10:56:46 2012 From: blew w doktorant.umk.pl (Bartosz Lew) Date: Sun, 4 Nov 2012 10:56:46 +0100 Subject: [Cosmo-torun] Newtonian N-body wrong in EdS relativistic 2nd order perturbation theory above 10 Mpc In-Reply-To: References: Message-ID: <201211041056.46812.blew@doktorant.umk.pl> Hi, http://arxiv.org/abs/1211.0011 Newtonian N-body still valid approach to structure formation sims. even at large scales... Note the acknowledgements section that suggests that the authors of this paper discussed their results with the authors of the previous paper by Flender and Schwarz. On Tuesday 10 of July 2012 12:45:52 Boud Roukema wrote: > hi everyone > > http://arxiv.org/abs/1207.2035 > Newtonian versus relativistic cosmology > Authors: Samuel F. Flender, Dominik J. Schwarz > > Abstract: We show how the relativistic matter and velocity power > spectra behave in different gauges. We construct a new gauge where > both spectra coincide with Newtonian theory on all > scales. However, in this gauge there are geometric quantities > present which do not exist in Newtonian theory, for example the > local variation of the Hubble parameter. Comparing this quantity > to second order Newtonian quantities, we find that Newtonian > theory is wrong on scales larger than 10 Mpc. This undermines the > reliability of Newtonian cosmological N-body simulations on these > scales. > > > What's surprising is that this is still only *perturbation* theory, > it's not fully relativistic, if I understand the paper correctly. > Fully relativistic calculations still remain to be done. > > pozdr > boud > > _______________________________________________ > Cosmo-torun mailing list > Cosmo-torun w cosmo.torun.pl > http://cosmo.torun.pl/mailman/listinfo/cosmo-torun -- ================================================ Bartosz Lew Nicolaus Copernicus University, Torun Centre for Astronomy, Department of Radio-Astronomy tel: +48 (56) 611 3042 email:blew w astro.uni.torun.pl, www: http://cosmos.astro.uni.torun.pl/~blew -------------- następna część --------- Załącznik HTML został usunięty... URL: From blew w doktorant.umk.pl Sun Nov 4 10:56:46 2012 From: blew w doktorant.umk.pl (Bartosz Lew) Date: Sun, 4 Nov 2012 10:56:46 +0100 Subject: [Cosmo-torun] Newtonian N-body wrong in EdS relativistic 2nd order perturbation theory above 10 Mpc In-Reply-To: References: Message-ID: <201211041056.46812.blew@doktorant.umk.pl> Hi, http://arxiv.org/abs/1211.0011 Newtonian N-body still valid approach to structure formation sims. even at large scales... Note the acknowledgements section that suggests that the authors of this paper discussed their results with the authors of the previous paper by Flender and Schwarz. On Tuesday 10 of July 2012 12:45:52 Boud Roukema wrote: > hi everyone > > http://arxiv.org/abs/1207.2035 > Newtonian versus relativistic cosmology > Authors: Samuel F. Flender, Dominik J. Schwarz > > Abstract: We show how the relativistic matter and velocity power > spectra behave in different gauges. We construct a new gauge where > both spectra coincide with Newtonian theory on all > scales. However, in this gauge there are geometric quantities > present which do not exist in Newtonian theory, for example the > local variation of the Hubble parameter. Comparing this quantity > to second order Newtonian quantities, we find that Newtonian > theory is wrong on scales larger than 10 Mpc. This undermines the > reliability of Newtonian cosmological N-body simulations on these > scales. > > > What's surprising is that this is still only *perturbation* theory, > it's not fully relativistic, if I understand the paper correctly. > Fully relativistic calculations still remain to be done. > > pozdr > boud > > _______________________________________________ > Cosmo-torun mailing list > Cosmo-torun w cosmo.torun.pl > http://cosmo.torun.pl/mailman/listinfo/cosmo-torun -- ================================================ Bartosz Lew Nicolaus Copernicus University, Torun Centre for Astronomy, Department of Radio-Astronomy tel: +48 (56) 611 3042 email:blew w astro.uni.torun.pl, www: http://cosmos.astro.uni.torun.pl/~blew -------------- następna część --------- Załącznik HTML został usunięty... URL: -------------- następna część --------- _______________________________________________ Cosmo-torun mailing list Cosmo-torun w cosmo.torun.pl http://cosmo.torun.pl/mailman/listinfo/cosmo-torun From biblio w cbk.waw.pl Tue Nov 6 12:17:57 2012 From: biblio w cbk.waw.pl (=?UTF-8?B?UGF3ZcWCIEdyb2Nob3dhbHNraQ==?=) Date: Tue, 06 Nov 2012 12:17:57 +0100 Subject: [Cosmo-torun] =?utf-8?q?The_Bohdan_Paczynski_Memorial_Colloquium_?= =?utf-8?q?=28fwd=29_-_pierwszy_wyk=C5=82ad_16=2E11=2E2012?= In-Reply-To: References: Message-ID: <5098F1E5.9000408@cbk.waw.pl> Szanowni Panstwo, Centrum Astronomiczne im. M. Kopernika PAN w Warszawie otwiera serię wykładów "The Bohdan Paczyński Memorial Colloquium". Szczegoly na stronie: www.camk.edu.pl/PaczynskiColloquium Zapraszamy na pierwszy wykład, który odbędzie się 16 listopada o 15:00, w Warszawie, ul. Bartycka 18: *Rashid Sunyaev* Max-Planck Institute for Astrophysics, Space Research Institute, Moscow, Institute for Advanced Study, Princeton *Hot Intergalactic Gas in Clusters of Galaxies,Cosmic Microwave Background Radiation and Cosmology* Marek Abramowicz Joanna Mikolajewska -------------------------------------------------------------------- Prof. Joanna Mikolajewska Phone: +48 22 3296134 N. Copernicus Astronomical Center Fax: +48 22 8410046 Bartycka 18 E-mail: mikolaj w camk.edu.pl 00-716 Warszawa, Poland Web: www.camk.edu.pl -------------------------------------------------------------------- -------------- następna część --------- Załącznik HTML został usunięty... URL: -------------- następna część --------- _______________________________________________ Cosmo-torun mailing list Cosmo-torun w cosmo.torun.pl http://cosmo.torun.pl/mailman/listinfo/cosmo-torun From boud w astro.uni.torun.pl Wed Nov 7 15:25:15 2012 From: boud w astro.uni.torun.pl (Boud Roukema) Date: Wed, 7 Nov 2012 15:25:15 +0100 (CET) Subject: [Cosmo-torun] =?iso-8859-2?q?The_Bohdan_Paczynski_Memorial_Colloq?= =?iso-8859-2?q?uium_=28fwd=29_-_pierwszy_wyk=B3ad_16=2E11=2E2012_?= =?iso-8859-2?q?=28fwd=29?= Message-ID: > Szanowni Panstwo, > > Centrum Astronomiczne im. M. Kopernika PAN w Warszawie otwiera serię wykładów "The Bohdan Paczyński Memorial Colloquium". > Szczegoly na stronie: www.camk.edu.pl/PaczynskiColloquium > > Zapraszamy na pierwszy wykład, który odbędzie się 16 listopada o 15:00, > w Warszawie, ul. Bartycka 18: > > Rashid Sunyaev > > Max-Planck Institute for Astrophysics, Space Research Institute, Moscow, > Institute for Advanced Study, Princeton > > Hot Intergalactic Gas in Clusters of Galaxies,Cosmic Microwave Background Radiation and Cosmology > > Marek Abramowicz > Joanna Mikolajewska > > -------------------------------------------------------------------- > Prof. Joanna Mikolajewska Phone: +48 22 3296134 > N. Copernicus Astronomical Center Fax: +48 22 8410046 > Bartycka 18 E-mail: mikolaj camk.edu.pl > 00-716 Warszawa, Poland Web: www.camk.edu.pl > -------------------------------------------------------------------- -------------- następna część --------- _______________________________________________ Cosmo-torun mailing list Cosmo-torun w cosmo.torun.pl http://cosmo.torun.pl/mailman/listinfo/cosmo-torun