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首页> 外文期刊>Gravitation and Cosmology: G&C >A Tachyon Cosmological Model with Non-Minimal Derivative Coupling to Gravity
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A Tachyon Cosmological Model with Non-Minimal Derivative Coupling to Gravity

机译:具有引力非最小导数耦合的Tachyon宇宙学模型

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摘要

We study a tachyon model with non-minimal derivative coupling to gravity in the Friedmann-Robertson-Walker (FRW) flat cosmology. We suggest a special re-definition of the tachyon field which allows us to present the tachyon field equation in a form coinciding with the equation for minimal coupling but with a re-definedHubble parameter. Two first integrals for the model equations are obtained, which can substantially simplify both the further analysis and analytical solution of the model. These integrals become 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.
机译:我们在弗里德曼·罗伯逊·沃克(FRW)平面宇宙学中研究了具有非最小导数与引力耦合的tachyon模型。我们建议重新定义tachyon场,使我们能够以与最小耦合耦合方程式相同的形式呈现tachyon场方程,但具有重新定义的Hubble参数。获得了模型方程的两个第一积分,这可以大大简化模型的进一步分析和解析解。在最小耦合的情况下,这些积分变得无关紧要。获得了tachyon场的有效能量密度和压力,并推导了该模型随加速度扩展的可能性的必要条件。

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