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Tachyon field inspired dark energy and supernovae constraints

Authors
  • Ren, Jie
  • Meng, Xin-He
Type
Published Article
Publication Date
Mar 07, 2008
Submission Date
Oct 09, 2006
Identifiers
DOI: 10.1142/S0218271808013893
Source
arXiv
License
Unknown
External links

Abstract

The tachyon field in cosmology is studied by applying the generating function method to obtain exact solutions. The equation of state parameter of the tachyon field is $w=-1+\epsilon\dot{\phi^2}$, which can be expressed as a function in terms of the redshift $z$. Based on these solutions, we propose some tachyon-inspired dark energy models to explore the properties of the corresponding cosmological evolution. The explicit relations between Hubble parameter and redshift enable us to test the models with SNe Ia data sets easily. In the current work we employ the SNe Ia data with the parameter $\mathcal{A}$ measured from the SDSS and the shift parameter $\mathcal{R}$ from WMAP observations to constrain the parameters in our models.

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