On Primordial Density Perturbation and Decaying Speed of Sound

Details On Primordial Density Perturbation and Decaying Speed of Sound On Primordial Density Perturbation and Decaying Speed of Sound

2008-07-21

arxiv.org/abs/0807.3226v2

Phys.Rev.D79:067301,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

3 pages, 2 eps figure, contents extended, refs. added, published version,

Scientific paper

10.1103/PhysRevD.79.067301

The decaying speed of sound can lead to the emergence of the primordial density perturbation in any expanding phase, even if the expansion is decelerated. Recently, some proposals have been given to implement this mechanism, in which it was found that the primordial spectrum of scalar perturbation can be scale invariant. In this note, we will give more insights for the details of this seeding mechanism.

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