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arXiv 1408.0107gr-qcastro-ph.COhep-th
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$F(T,T_G)$引力的宇宙学应用

Cosmological applications of $F(T,T_G)$ gravity

Georgios Kofinas, Emmanuel N. Saridakis

摘要:

研究了$F(T,T_G)$引力在宇宙学中的应用. $F(T,T_G)$是一种新的修正引力理论,它基于挠率不变的$T$和高斯-邦纳项$T_{G}$的遥平行等价. $F(T,T_{G})$引力既不同于$F(T)$理论,也不同于曲率修正引力的$F(R,G)$类,因此它对应的宇宙学被证明是非常有趣的。特别是,它提供了一个统一的描述宇宙学的历史,从早期的膨胀到晚期的自加速,而不包括一个宇宙学常数。此外,根据模型的参数,暗能量状态方程参数可以是精粹或幻影状的,或者经历幻影分界线交叉。

英文摘要:

We investigate the cosmological applications of $F(T,T_G)$ gravity, which is a novel modified gravitational theory based on the torsion invariant $T$ and the teleparallel equivalent of the Gauss-Bonnet term $T_{G}$. $F(T,T_{G})$ gravity differs from both $F(T)$ theories as well as from $F(R,G)$ class of curvature modified gravity, and thus its corresponding cosmology proves to be very interesting. In particular, it provides a unified description of the cosmological history from early-times inflation to late-times self-acceleration, without the inclusion of a cosmological constant. Moreover, the dark energy equation-of-state parameter can be quintessence or phantom-like, or experience the phantom-divide crossing, depending on the parameters of the model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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