, Volume 62, Issue 3, pp 757–760 | Cite as

Tachyon field in cosmology

  • H. K. Jassal


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.


Cosmology tachyon field dark energy structure formation 


98.80.Cq 95.35.+d 


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Copyright information

© Indian Academy of Sciences 2004

Authors and Affiliations

  • H. K. Jassal
    • 1
  1. 1.Inter-University Centre for Astronomy and AstrophysicsGaneshkhind,PuneIndia

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