Cosmology past and ongoing projects in Toruń - brief summary for main page

Shape of the Universe

Scientific models of the Universe are intended to satisfy the Einstein field equations, that roughly speaking, state that curvature = density. The models allow many different sorts of spaces, which have the local property called a metric (a sort of rule for locally measuring distances, that determines curvature) and have global properties that define them, such as topology. Together curvature and topology can be described as shape.

Cosmic Topology

TODO boud: brief summary of cosmic topology and our observational and theoretical research program.

Metric parameters (curvature)

The metric of our Universe model has many parameters such as the Hubble parameter, the baryon density parameter, the non-baryonic dark matter density parameter, and the dark energy parameter.

Fluctuations

The Universe is not perfectly the same everywhere in space - there are fluctuations compared to the average density.

Observational constraints - low to high redshift

TODO boud: brief summary of observational large scale structure research programs, e.g. with Gary Mamon

CMB non-gaussianities, inflationary scenarios

Can a theory of inflation explain the origin of the density fluctuations? There are some observational hints that this might be the case. One of the research strategies for selecting an inflationary theory out of the many available scenarios is to check for non-Gaussian statistical properties of the fluctuations. TODO Bartek: Something about results/projects.

Collapsed objects

Density fluctuations on the smaller scales (up to about 1 Mpc) collapsed gravitationally, forming galaxy clusters and galaxies in which stars and planets formed. Comparing observations of galaxies and galaxy clusters to the cosmic microwave background and separating the two effects is a major theme of the observational aspects of the OCRA program using our 32m radio telescope.


See also CosmoProjectsOld
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I Attachment Action Size Date Who Comment
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circle__3.jpgjpg circle__3.jpg manage 25.8 K 04 Mar 2008 - 01:35 BoudRoukema this image is triple licensed CC-BY-SA/GPL/GFDL - choose the one you wish - it is created independently of figures in the article
circle__4.jpgjpg circle__4.jpg manage 24.8 K 04 Mar 2008 - 01:35 BoudRoukema this image is triple licensed CC-BY-SA/GPL/GFDL - choose the one you wish - it is created independently of figures in the article
circle__5.jpgjpg circle__5.jpg manage 30.0 K 04 Mar 2008 - 01:36 BoudRoukema this image is triple licensed CC-BY-SA/GPL/GFDL - choose the one you wish - it is created independently of figures in the article
circle__6.jpgjpg circle__6.jpg manage 39.4 K 04 Mar 2008 - 01:36 BoudRoukema this image is triple licensed CC-BY-SA/GPL/GFDL - choose the one you wish - it is created independently of figures in the article
dodec-aa.psps dodec-aa.ps manage 1274.6 K 17 May 2004 - 14:55 BoudRoukema revised after referee's comments - single-spaced
isolat-aa.psps isolat-aa.ps manage 164.8 K 10 Nov 2004 - 16:23 BoudRoukema version on astro-ph
mhg_20050210.psps mhg_20050210.ps manage 177.4 K 10 Feb 2005 - 13:05 BoudRoukema Calabretta & Roukema, draft 10 Feb 2005
mhg_20050330.psps mhg_20050330.ps manage 173.6 K 30 Mar 2005 - 14:19 BoudRoukema Calabretta & Roukema, draft 30 March 2005
mhg_20050615.psps mhg_20050615.ps manage 177.3 K 19 Sep 2005 - 13:00 BoudRoukema Calabretta & Roukema, draft 15 June 2005
Topic revision: r32 - 02 Jul 2010, BoudRoukema
 
DOWNTIME: around 7:00-14:00 UTC+1 Fri 16 November 2018 (might come back up earlier)
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