Cosmological perturbations in $k$-essence model

Details Cosmological perturbations in $k$-essence model Cosmological perturbations in $k$-essence model

2011-09-06

arxiv.org/abs/1109.1308v3

Physics

High Energy Physics

High Energy Physics - Theory

21 pages, sentences and equations are corrected, conclusions are changed a little

Scientific paper

Subhorizon approximation is often used in cosmological perturbation theory. In this paper, however, it is shown that the subhorizon approximation is not always a good approximation at least in case of $k$-essence model. We also show that the sound speed given by $k$-essence model exerts a huge influence on the time evolution of the matter density perturbation, and the future observations could clarify the differences between the $\Lambda$CDM model and $k$-essence model.

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