Speedy sound and cosmic structure

Details Speedy sound and cosmic structure Speedy sound and cosmic structure

2008-03-06

arxiv.org/abs/0803.0859v2

Phys.Rev.Lett.100:231302,2008

Astronomy and Astrophysics

Astrophysics

To be published in Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.100.231302

If the speed of sound were vastly larger in the early Universe a near scale-invariant spectrum of density fluctuations could have been produced even if the Universe did not submit to conventional solutions to the horizon problem. We examine how the mechanism works, presenting full mathematical solutions and their heuristics. We then discuss several concrete models based on scalar fields and hydrodynamical matter which realize this mechanism, but stress that the proposed mechanism is more fundamental and general.

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