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Article overview
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Deformed Horava-Lifshitz Cosmology and Stability of Einstein Static Universe | | Y. Heydarzade
; M. Khodadi
; F. Darabi
; | | Date: |
16 Feb 2015 | | Abstract: | Stability of the Einstein static universe versus the linear scalar, vector
and tensor perturbations is investigated in the context of deformed
Hov{r}ava-Lifshitz cosmology inspired by entropic force scenario. A general
stability condition against the linear scalar perturbations is obtained. Using
this general condition, it is shown that there is no stable Einstein static
universe for the case of flat universe, $k=0$. For the the special case of
large values of running parameter of HL gravity $omega$, in a positively
curved universe $k>0$, the domination of the quintessence and phantom matter
fields with barotropic equation of state parameter $eta<-frac{1}{3}$ is
necessary while for a negatively curved universe $k<0$, the matter fields with
$eta> -frac{1}{3}$ are needed to be the dominant fields of the universe.
Also, a neutral stability against the vector perturbations is obtained.
Finally, an inequality including the cosmological parameters of the Einstein
static universe is obtained for the stability against the tensor perturbations.
It turns out that for large $omega$ values, there is a stability against the
tensor perturbations. | | Source: | arXiv, 1502.4445 | | Services: | Forum | Review | PDF | Favorites | |
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