Cosmological constraints on the matter equation of state

Details Cosmological constraints on the matter equation of state Cosmological constraints on the matter equation of state

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phrvd..80f3539c&link_type=abstract

Physical Review D, vol. 80, Issue 6, id. 063539

Mathematics

Logic

1

Particle-Theory And Field-Theory Models Of The Early Universe, Dark Matter, Background Radiations

Scientific paper

We investigate the impact of a nonstandard time evolution of the dark matter component on current cosmological bounds from cosmic microwave background (CMB) anisotropies. We found that a less than 0.1% variation in the effective dark matter equation of state wdm can drastically change current CMB bounds on the matter density, the Hubble parameter and the age of the Universe. A flat universe without dark energy could provide an excellent fit to current CMB data, providing that wdm˜-10-2.

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