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arXiv · 1607.05318

Evolution of spherical over-densities in tachyon scalar field model

M. R. Setare·F. Felegary·F. Darabi
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Abstract

We study the tachyon scalar field model in flat FRW cosmology with the particular potential $\phi^{-2}$ and the scale factor behavior $a(t)=t^n$. We consider the spherical collapse model and investigate the effects of the tachyon scalar field on the structure formation in flat FRW universe. We calculate $\delta_{c}(z_{c})$, $\lambda(z_{c})$, $\xi(z_{c})$, $\Delta_{V}(z_{c})$, $\log [\nu f(\nu)]$ and $\log [n(k)]$ for the tachyon scalar field model and compare the results with the results of EdS model and $\Lambda CDM$ model. It is shown that in the tachyon scalar field model the structure formation may occur earlier, in comparison to the other models.

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M. R. Setare, F. Felegary, F. Darabi. 2016-07-18. Evolution of spherical over-densities in tachyon scalar field model. https://doi.org/10.1016/j.physletb.2017.06.039

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