Tachyon field in cosmology |
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Authors: | H. K. Jassal |
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Affiliation: | (1) Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, 411 007 Ganeshkhind,Pune, India |
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Abstract: | We study cosmological effects of homogeneous tachyon field as dark energy. We concentrate on two different scalar field potentials, the inverse square potential and the exponential potential. These models have a unique feature that the matter density parameter and the density parameter for tachyons remain comparable for a large range in red-shift. It is shown that there exists a range of parameters for which the universe undergoes an accelerated expansion and the evolution is consistent with structure formation requirements. For a viable model we require fine tuning of parameters comparable to that in ACDM or in quintessence models. For the exponential potential, the accelerated phase is followed by a phase witha(t) α t 2/3 thus eliminating a future horizon. |
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Keywords: | Cosmology tachyon field dark energy structure formation |
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