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

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Shape of the Universe

RBSG08 image metric parameters image 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. The metric of our Universe model has many parameters such as the Hubble parameter, the baryon density parameter, the baryonic and non-baryonic dark matter density parameter \Omega_m, and the dark energy parameter \Omega_\Lambda.

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
Topic attachments
I Attachment Action Size Date Who Comment
metric_par.jpgjpg metric_par.jpg manage 55.8 K 14 Jul 2010 - 02:03 BoudRoukema ArXiv:0106135
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Topic revision: r2 - 14 Jul 2010, BoudRoukema
 
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