Dark energy in modified Gauss-Bonnet gravity: Late-time acceleration and the hierarchy problem
Dark energy in modified Gauss-Bonnet gravity: Late-time acceleration and the hierarchy problem
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DOI：
10.1103/physrevd.73.084007
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发表时间：
2006-04-01
影响因子：
5
通讯作者：
Zerbini, S
中科院分区：
文献类型：
--
作者：
Cognola, G;Elizalde, E;Zerbini, S
在一个改进的高斯-邦尼（GB）引力模型中考虑暗能量宇宙学，其中GB不变量f（G）的任意函数被添加到广义相对论作用量中。我们表明，这种理论被赋予了相当丰富的宇宙学结构：它可能会自然地导致一个有效的宇宙学常数，精华，或幻影宇宙加速，从减速到加速的过渡的可能性。本文证明了这一理论是完全可行的，因为它符合太阳系的约束。研究了f（G）引力在de Sitter（dS）宇宙中的特殊性质，如dS和SdS解，它们的熵，以及它的显式单圈量子化.修正重力的层次问题的可能解决方案的问题也得到了解决。
Dark energy cosmology is considered in a modified Gauss-Bonnet (GB) model of gravity where an arbitrary function of the GB invariant, f(G), is added to the general relativity action. We show that a theory of this kind is endowed with a quite rich cosmological structure: it may naturally lead to an effective cosmological constant, quintessence, or phantom cosmic acceleration, with a possibility for the transition from deceleration to acceleration. It is demonstrated in the paper that this theory is perfectly viable, since it is compliant with the solar system constraints. Specific properties of f(G) gravity in a de Sitter (dS) universe, such as dS and SdS solutions, their entropy, and its explicit one-loop quantization are studied. The issue of a possible solution of the hierarchy problem in modified gravities is also addressed.