Modelling Tachyon Cosmology with Non-Minimal Derivative Coupling to Gravity

Details Modelling Tachyon Cosmology with Non-Minimal Derivative Coupling to Gravity Modelling Tachyon Cosmology with Non-Minimal Derivative Coupling to Gravity

2011-05-23

arxiv.org/abs/1105.4536v3

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages

Scientific paper

We study a tachyon model with non-minimal derivative coupling to gravity in the Friedmann-Robertson-Walker flat cosmology. We propose the special re-definition of the tachyon field which allows us to represent tachyon field equation formally coinciding with its usual form but with re-defined Hubble parameter. Two first integrals for the model equations are obtained that can essentially simplify both further analysis and analytical solving for the model. These integrals become the trivial identities in the case of minimal coupling. The effective energy density and pressure of the tachyon field are obtained, and the necessary condition of the possibility for this model to expand with acceleration is derived.

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