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What is needed of a tachyon if it is to be the dark energy?

Edmund J. Copeland1, Mohammad R. Garousi2, M. Sami3, and Shinji Tsujikawa4

  • 1Department of Physics and Astronomy, University of Sussex, Falmer, Brighton BN1 9QJ, United Kingdom
  • 2Department of Physics, Ferdowsi University, P.O. Box 1436, Mashhad, Iran and Institute for Studies in Theoretical Physics and Mathematics IPM, P.O. Box 19395-5531, Tehran, Iran
  • 3IUCAA, Post Bag 4, Ganeshkhind, Pune 411 007, India
  • 4Department of Physics, Gunma National College of Technology, Gunma 371-8530, Japan

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Phys. Rev. D 71, 043003 – Published 10 February, 2005

DOI: https://doi.org/10.1103/PhysRevD.71.043003

Abstract

We study a dark energy scenario in the presence of a tachyon field ϕ with potential V(ϕ) and a barotropic perfect fluid. The cosmological dynamics crucially depends on the asymptotic behavior of the quantity λ=−MpVϕ/V3/2. If λ is a constant, which corresponds to an inverse square potential V(ϕ)∝ϕ−2, there exists one stable critical point that gives an acceleration of the Universe at late times. When λ→0 asymptotically, we can have a viable dark energy scenario in which the system approaches an instantaneous critical point that dynamically changes with λ. If |λ| approaches infinity asymptotically, the Universe does not exhibit an acceleration at late times. In this case, however, we find an interesting possibility that a transient acceleration occurs in a regime where |λ| is smaller than of order unity.

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Phys. Rev. D 71, 043003– Published 10 February, 2005
  • Received 25 November 2004

© 2005 American Physical Society

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