Cosmo-torun

cosmo-torun@cosmo.torun.pl

328 discussions

Cosmography of the local Univese - nice animation.
by Tomasz Kazimierczak 15 Jun '14

15 Jun '14

Hi cosmo-torun, A nice animation of the local Universe made by Hélène Courtois, Daniel Pomarède, R. Brent Tully, Yehuda Hoffman, and Denis Courtois link: http://vimeo.com/66641648 and theirs publication: http://arxiv.org/abs/1306.0091 What is astonishing for me, it is velocity field and flow of matter reconstruction. Cheers, Tomek ================================================ Tomasz Kazimierczak Nicolaus Copernicus University, Torun Centre for Astronomy, Department of Radio Astronomy email: tomasz.kazimierczak(a)astro.uni.torun.pl

1 0

B-modes: premature discovery announcement?
by Boud Roukema 23 May '14

23 May '14

hi cosmo-torun, A joint analysis of Planck and BICEP2 B modes including dust polarization uncertainty Michael J. Mortonson, Uroš Seljak http://arxiv.org/abs/1405.5857 "... The resulting joint BICEP2+Planck analysis favors solutions without gravity waves, and the upper limit on the tensor-to-scalar ratio is $r<0.11$, a slight improvement relative to the Planck analysis alone which gives $r<0.13$ ($95\%$ c.l.). The estimated amplitude of the dust polarization power spectrum is in rough agreement with expectations for this field based on HI column density. ..." Popular science description: https://www.sciencemag.org/content/344/6186/790.full pozdr Boud

1 0

proof for gravitational waves?
by Tomasz Kazimierczak 18 Mar '14

18 Mar '14

Hi all, Hot news in media, according to which there is detection of gravitational waves by the BICEP2 experiment. It is something about messuring b-mode polarisation of CMB, that's all what I undersdand. Links: media: http://news.stanford.edu/news/2014/march/physics-cosmic-inflation-031714.ht… project: http://bicepkeck.org/ paper:http://bicepkeck.org/b2_respap_arxiv_v1.pdf Can we say it is a direct evidence for gravitational waves or rather it should be said indirect? Pozdr, Tomek

2 1

Proposed PRISM space mission (fwd)
by Boud Roukema 11 Jul '13

11 Jul '13

> ---------- Forwarded message ---------- > Date: Wed, 10 Jul 2013 20:38:22 +0200 > From: Jacques Delabrouille ... > To: boud ... > Subject: Proposed PRISM space mission > > Dear Boud, > As you may have heard, we have answered the recent call for science themes for future ESA missions with a concept called PRISM (Polarised Radiation > Imaging and Spectroscopy Mission) -- The name was given before we heard of the NSA's version of PRISM... > As this mission might be of interest to you and your colleagues in Torun, I am sending you this information, which I encourage you to send to the > Polish community susceptible to be interested in this science, either on the theoretical or the experimental side, and/or involved in the project. > > The main idea of the mission is an ultra-sensitive spectro-polarimetric survey of the entire sky from about 30 GHz to about 6 THz. > > The science case is as broad as possible to serve a very large scientific community. The main themes for cosmology and fundamental physics are: > - A complete census of the Dark Matter, hot gas, dusty galaxies in our Hubble volume, and corresponding constraints on cosmology, dark energy, > cluster physics, structure formation, star formation, etc. > - The ultimate measurement of CMB polarization, to constrain primordial GW and inflationary scenarios > - The measurement of the CMB frequency spectrum, to explore energy injection at z<10^6 by processes such as reionization, decay of DM particles, > evaporation of mini black holes, etc. > > Details are in http://adsabs.harvard.edu/abs/2013arXiv1306.2259P and on our website (http://www.prism-mission.org). > > Do not hesitate to ask questions if you have any. Support (by signing-up and encouraging people to sign-up on our web site) would be very useful > (there are already a small number of Polish scientists who expressed interest, but I am sure many more still have not received this information). > > Best, > > Jacques > > > ----------------------------------------------------------------- > Jacques Delabrouille > CNRS, Laboratoire APC, > Université Paris Diderot, Bâtiment Condorcet > 10, rue Alice Domon et Léonie Duquet > 75205 Paris cedex 13, FRANCE > Telephone: +33 1 57 27 60 40 > Fax: +33 1 57 27 60 71 > ----------------------------------------------------------------- > http://www.apc.univ-paris7.fr/~delabrou/ > -----------------------------------------------------------------

1 0

Mon 24 June 2013 cosmo workshop proposal
by Boud Roukema 23 Jun '13

23 Jun '13

hi everyone Here's my proposal for our workshop Monday 24 June. Each speaker is free to divide up the 30 minutes how he wishes, but the aim is for this to be interactive, so I suggest a maximum of 15-20 minutes of "presentation". TCfA Cosmology workshop 24.06.2013 @KRA 14:00 Roukema - TCfA cosmology group 14:20 Lew - Search for SZ galaxy clusters in simulations 14:50 - 10 minutes break 15:00 Kazimierczak - cosmic topology 15:30 Fujii - Nontoroidal topological lensing among SDSS quasars 16:00 Buliński - cosmic topology 16:10 - 10 minutes break 16:40 Ostrowski - inhomogeneous cosmo - Lagrangian approach 17:10 Matczyński - cosmology tools: IPython Może być? pozdr boud

3 4

Planck pdf presentations
by Boud Roukema 19 Apr '13

19 Apr '13

hi cosmo-torun Some Planck pdf presentations: http://www.rssd.esa.int/index.php?project=PLANCK&page=47_ESLAB pozdr boud

1 0

CMB data from PLANCK revealed
by Tomasz Kazimierczak 22 Mar '13

22 Mar '13

Hi cosmo-torun, First CMB data from PLANCK mission revealed! http://www.esa.int/Our_Activities/Space_Science/Planck/Planck_reveals_an_al… Pozdr, Tomek

1 0

13:00 Fri 22 Mar: Virialization-induced curvature as a physical explanation for dark energy
by Boud Roukema 20 Mar '13

20 Mar '13

hi cosmo-torun For this Friday I propose a combined workshop and "Kosmologia" lecture. The one-line sound-bite is: "dark energy is the ordinary, relativistic, negative curvature of voids, which FLRW doesn't allow". 13:00 Fri 22 Mar: Virialization-induced curvature as a physical explanation for dark energy Abstract: "Dark energy" occurs during the redshift range over which the Universe becomes virialised, i.e. inhomogeneous, meaning that the homogeneous model should fail. Adding virialisation-induced negative curvature (of voids) to an Einstein-de Sitter (Omega_m = 1, Omega_Lambda = 0) model brings its d_L(z) relation close to that of the standard, Newtonian-void LambdaCDM model. Dark energy is most simply interpreted as an artefact of forcing voids to be flat, Newtonian voids. URL: http://arXiv.org/abs/1303.4444 For official "Kosmologia" hours, the doktoranci should stay a little longer for discussion. pozdr boud

1 0

linear perturbation theory - special Kosmologia session 16-17.40 Thur 21 Feb
by Boud Roukema 22 Feb '13

22 Feb '13

witam cosmo-torun Tomorrow Thursday 21 Feb from 16.00 @KRA, Jan will give a talk on linear perturbation theory in cosmology. This is officially Jan's exam for the Kosmologia course, but scientifically it should be interesting for everyone in the cosmology group, especially Zbyszek and Maciej S. Galaxies exist: we need to understand how to quantitatively, statistically model their existence in a relativistic universe model - but this talk will mostly focus on the standard (Newtonian cosmology) approach. pozdr boud _______________________________________________ Cosmo-torun mailing list Cosmo-torun(a)cosmo.torun.pl http://cosmo.torun.pl/mailman/listinfo/cosmo-torun

1 1

inhomogeneous workshop: BKS Tues 18 Dec 12:30-15:30 @KRA
by Boud Roukema 17 Dec '12

17 Dec '12

hi everyone Inhomogeneous workshop Tues 18 Dec 12:30-15:30 @KRA. This is mainly for people directly working on inhomogeneous cosmo topics, but others are welcome to come along and participate in part of the discussions - you don't have to stay for the full session! Main topic: work/talk through BKS: http://cdsads.u-strasbg.fr/abs/2000PhRvD..62d3525B see you tomorrow boud _______________________________________________ Cosmo-torun mailing list Cosmo-torun(a)cosmo.torun.pl http://cosmo.torun.pl/mailman/listinfo/cosmo-torun

1 0

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