Thermodynamic laws for generalized f(R) gravity with curvature-matter coupling

Thermodynamic laws for generalized f(R) gravity with curvature-matter coupling
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具有曲率-物质耦合的广义 f(R) 引力的热力学定律

DOI:
10.1016/j.physletb.2012.10.008
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发表时间:
2012-10
期刊:
影响因子:
4.4
通讯作者:
Gao, Xiao-Jing
Gao, Xiao-Jing
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wu, Ya-Bo;Zhao, Yue-Yue;Cai, Rong-Gen;Lu, Jian-Bo;Lu, Jun-Wang;Gao, Xiao-Jing

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在空间均匀、各向同性的FRW宇宙中,研究了曲率-物质耦合的广义f(R)引力的热力学第一定律和广义第二定律.研究结果表明,考虑曲率-物质耦合的广义f(R)引力场方程可以转化为具有熵产生项dS ′的热力学第一定律的形式,而GSL可以由具有Hawking温度的动力学视视界所包围的仅充满普通物质的FRW宇宙给出.此外,作为一个具体的例子,还利用GSL讨论了f_1(R)=R+α R和f_2(R)= R的引力模型的约束。值得注意的是,我们给出的结果是相当一般的,可以退化到爱因斯坦广义相对论和纯f(R)引力中的结果,作为非耦合和非最小耦合的特殊情况。与爱因斯坦广义相对论的情况相比,热力学第一定律中熵产生项dS <$的出现表明,对于曲率-物质耦合的广义f(R)引力,视界热力学是非平衡态的,这与Akbar and Cai(2007)[13]和Eling et al.(2006)[18]中给出的论点一致。
The first law and the generalized second law (GSL) of thermodynamics for the generalized f(R) gravity with curvature–matter coupling are studied in the spatially homogeneous, isotropic FRW universe. The research results show that the field equations of the generalized f(R) gravity with curvature–matter coupling can be cast to the form of the first law of thermodynamics with the so-called the entropy production terms dS¯ and the GSL can be given by considering the FRW universe filled only with ordinary matter enclosed by the dynamical apparent horizon with the Hawking temperature. Furthermore, as a concrete example, by utilizing the GSL the constraints on the gravitational model with f1(R)=R+αRland f2(R)=Rmare also discussed. It is worth noting these results given by us are quite general and can degenerate to the ones in Einsteinʼs general relativity and pure f(R) gravity with non-coupling and non-minimal coupling as special cases. Comparing with the case of Einsteinʼs general relativity, the appearance of the entropy production term dS¯ in the first law of thermodynamics demonstrates that the horizon thermodynamics is non-equilibrium one for generalized f(R) gravity with curvature–matter coupling, which is consistent with the arguments given in Akbar and Cai (2007) [13] and Eling et al. (2006) [18].
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