Cosmological Imprints of a Generalized Chaplygin Gas Model for the Early Universe

Details Cosmological Imprints of a Generalized Chaplygin Gas Model for the Early Universe Cosmological Imprints of a Generalized Chaplygin Gas Model for the Early Universe

2011-04-04

arxiv.org/abs/1104.0676v1

Phys.Rev.D84:023505,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, 8 figures. RevTex4

Scientific paper

10.1103/PhysRevD.84.023505

We propose a phenomenological model for the early universe where there is a smooth transition between an early "quintessence" phase and a radiation dominated era. The matter content is modelled by an appropriately modified Chaplygin gas for the early universe. We constrain the model observationally by mapping the primordial power spectrum of the scalar perturbations to the latest data of WMAP7. We compute as well the spectrum of the primordial gravitational waves as would be measured today. We show that the high frequencies region of the spectrum depends on the free parameter of the model and most importantly this region of the spectrum can be within the reach of future gravitational waves detectors.

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