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      Extended Chaplygin Gas in Horava-Lifshitz Gravity

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          Abstract

          In this paper, we investigate cosmological models of the extended Chaplygin gas in a universe governed by Horava-Lifshitz gravity. The equation of state for an extended Chaplygin gas is a \((n+2)\)-variable equation determined by \(A_{n}\), \(\alpha\), and \(B\). In this work, we are interested to the case of second order \((n=2)\) equation of state which recovers quadratic barotropic equation of state. In that case there are four free parameters. We solve conservation equation approximately and obtain energy density in terms of scale factor with mentioned free parameters. Under some assumptions we relate free parameters to each other to have only one free independent parameter \((A_{2})\). It help us to obtain explicit expression for energy density in terms of scale factor. The allowed values of the second order extended Chaplygin gas parameter is determined using the recent astrophysical and cosmological observational data.

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          Author and article information

          Journal
          2014-12-08
          2015-07-11
          Article
          1412.2605
          f90ea17a-7e71-4494-b152-7731cac21383

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          16 pages, 3 figures
          gr-qc hep-th

          General relativity & Quantum cosmology,High energy & Particle physics
          General relativity & Quantum cosmology, High energy & Particle physics

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