Evolution of spherical over-densities in tachyon scalar field model

We study the tachyon scalar field model in flat FRW cosmology with the particular potential ϕ−2 and the scale factor behavior a(t)=tn. 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 δc(zc)...

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Main Authors:	M.R. Setare, F. Felegary, F. Darabi
Format:	Article
Language:	English
Published:	Elsevier 2017-09-01
Series:	Physics Letters B
Online Access:	http://www.sciencedirect.com/science/article/pii/S0370269317305154

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record_format	Article
spelling	doaj-d5af1b199cfb4f9ab13ddf794af687892020-11-25T01:08:02ZengElsevierPhysics Letters B0370-26931873-24452017-09-01772C707710.1016/j.physletb.2017.06.039Evolution of spherical over-densities in tachyon scalar field modelM.R. Setare0F. Felegary1F. Darabi2Department of Science, Campus of Bijar, University of Kurdistan, Bijar, IranDepartment of Physics, Azarbaijan Shahid Madani University, Tabriz, 53714-161, IranDepartment of Physics, Azarbaijan Shahid Madani University, Tabriz, 53714-161, IranWe study the tachyon scalar field model in flat FRW cosmology with the particular potential ϕ−2 and the scale factor behavior a(t)=tn. 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 δc(zc), λ(zc), ξ(zc), ΔV(zc), log⁡[νf(ν)] and log⁡[n(k)] for the tachyon scalar field model and compare the results with the results of EdS model and ΛCDM model. It is shown that in the tachyon scalar field model the structure formation may occur earlier, in comparison to the other models.http://www.sciencedirect.com/science/article/pii/S0370269317305154
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	M.R. Setare F. Felegary F. Darabi
spellingShingle	M.R. Setare F. Felegary F. Darabi Evolution of spherical over-densities in tachyon scalar field model Physics Letters B
author_facet	M.R. Setare F. Felegary F. Darabi
author_sort	M.R. Setare
title	Evolution of spherical over-densities in tachyon scalar field model
title_short	Evolution of spherical over-densities in tachyon scalar field model
title_full	Evolution of spherical over-densities in tachyon scalar field model
title_fullStr	Evolution of spherical over-densities in tachyon scalar field model
title_full_unstemmed	Evolution of spherical over-densities in tachyon scalar field model
title_sort	evolution of spherical over-densities in tachyon scalar field model
publisher	Elsevier
series	Physics Letters B
issn	0370-2693 1873-2445
publishDate	2017-09-01
description	We study the tachyon scalar field model in flat FRW cosmology with the particular potential ϕ−2 and the scale factor behavior a(t)=tn. 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 δc(zc), λ(zc), ξ(zc), ΔV(zc), log⁡[νf(ν)] and log⁡[n(k)] for the tachyon scalar field model and compare the results with the results of EdS model and ΛCDM model. It is shown that in the tachyon scalar field model the structure formation may occur earlier, in comparison to the other models.
url	http://www.sciencedirect.com/science/article/pii/S0370269317305154
work_keys_str_mv	AT mrsetare evolutionofsphericaloverdensitiesintachyonscalarfieldmodel AT ffelegary evolutionofsphericaloverdensitiesintachyonscalarfieldmodel AT fdarabi evolutionofsphericaloverdensitiesintachyonscalarfieldmodel
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Evolution of spherical over-densities in tachyon scalar field model

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