On Primordial Density Perturbation and Decaying Speed of Sound
General Relativity and Quantum Cosmology
2009-11-06 v2 High Energy Physics - Theory
Abstract
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.
Keywords
Cite
@article{arxiv.0807.3226,
title = {On Primordial Density Perturbation and Decaying Speed of Sound},
author = {Yun-Song Piao},
journal= {arXiv preprint arXiv:0807.3226},
year = {2009}
}
Comments
3 pages, 2 eps figure, contents extended, refs. added, published version,