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THE k-ESSENCE IN THE RELATIVISTIC THEORY OF GRAVITATION AND GENERAL RELATIVITY

机译:在相对论的引力理论中的k-本质和一般相对论

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We consider a model of a scalar field with a nontrivial kinetic part (k-essence) on the background of a flat homogeneous isotropic universe in the framework of the relativistic theory of gravitation and general relativity. Such a scalar field simulates the substance of an ideal fluid and serves as a model of dark energy because it leads to cosmological acceleration at later times. For finding a suitable cosmological scenario, it is more convenient to determine the dependence of the energy density of such a field on the scale factor and only then find the corresponding Lagrangian. Based on the solution of such an inverse problem, we show that in the relativistic theory of gravitation, either any scalar field of this type leads to instabilities, or the compression stage ends at an unacceptably early stage. We note that a consistent model of dark energy in the relativistic theory of gravitation can be a scalar field with a negative potential (ekpyrosis) of Steinhardt-Turok. In general relativity, the k-essence model is viable and can represent both dark energy and dark matter. We consider several specific k-essence models.
机译:我们考虑一个标量场的模型,其具有非活动动力学部分(K-Escence),在相对论的引力理论的框架中,具有平坦的均匀各向同性宇宙的背景下的框架。这种标量场模拟理想流体的物质,并用作暗能量的模型,因为它会导致后面的宇宙加速度。为了找到合适的宇宙学情景,更方便地确定这种场的能量密度在比例因子上的依赖性,并且只找到相应的拉格朗日。基于这样的逆问题的解决方案,我们表明,在相对论的重力理论中,这种类型的任何标量领域导致不稳定性,或者压缩阶段以不可接受的早期阶段结束。我们注意到,在相对论的引力理论中,一个一致的暗能模型可以是具有斯坦德尔特 - 土耳巨霸的负势(Ekpyrys)的标量场。在一般相对性中,K-精华模型是可行的,可以代表暗能和暗物质。我们考虑了几种特定的k精华模型。

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