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arXiv 0811.4548gr-qc
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非齐次状态方程与宇宙学常数问题的求解

The inhomogeneous equation of state and the road towards the solution of the cosmological constant problem

Hrvoje Stefancic

摘要:

我们提出了一个包含一个宇宙学常数$Λ$和一个具有非齐次状态方程的组分的宇宙学模型。我们研究了非齐次状态方程的形式,该模型表现出宇宙学常数的松弛,即它渐近地趋向于de Sitter制度,其特征在于一个小的积极的有效宇宙学常数。宇宙学常数的松弛的效果观察到的$Λ$的负值和正值和模型参数的范围。一个特别的重点放在研究的CC松弛机制的细节和机制的鲁棒性模型参数的变化。结果表明,在所研究的模型中,由于真实的宇宙学常数的绝对值较大,所以在大的标度因子值下,有效的宇宙学常数较小。

英文摘要:

We present a cosmological model containing a cosmological constant $Λ$ and a component with an inhomogeneous equation of state. We study the form of the inhomogeneous equation of state for which the model exhibits the relaxation of the cosmological constant, i.e. it asymptotically tends to the de Sitter regime characterized by a small positive effective cosmological constant. The effect of the relaxation of the cosmological constant is observed both for negative and positive values of $Λ$ and for a range of model parameters. A special emphasis is put on the study of the details of the CC relaxation mechanism and the robustness of the mechanism to the variation of model parameters. It is found that within the studied model the effective cosmological constant at large scale factor values is small because the absolute value of the real cosmological constant is large.

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