arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2302.02133gr-qc
收藏

$4D$ Einstein-Gauss-Bonnet引力中的非奇异黑洞化学

Nonsingular black hole chemistry in $4D$ Einstein-Gauss-Bonnet gravity

Arun Kumar, Sushant G. Ghosh

摘要:

EGB是在$ D > 4$维中以Gauss-Bonnet(GB)项形式对Einstein-Hilbert引力作用量进行二次曲率修正的结果,并且EGB引力在$4D$维中是拓扑不变的.对于$ 4D $中的非平凡引力动力学,人们提出了几种正则化EGB的$ D \to 4 $极限的方法。受AdS/CFT重要性的启发,我们得到了AdS时空中耦合非线性电动力学(NED)的$4D$ EGB引力中的精确静态球对称非奇异黑洞.通过$ P=-Λ/8π$,我们将负宇宙学常数$Λ$解释为具有AdS背景的非奇异黑洞系统热力学性质的正压。我们发现,对于$P<P_c$,具有$C_P>0$的黑洞对热涨落是稳定的,反之则是不稳定的.我们还分析了吉布斯自由能,发现小的全局不稳定黑洞经历了一个相变到大的全局稳定黑洞。进一步,我们研究了系统的$P-V$临界性,然后计算临界指数,发现我们的系统表现出类似于范德瓦尔斯流体。

英文摘要:

The EGB is an outcome of quadratic curvature corrections to the Einstein-Hilbert gravity action in the form of a Gauss-Bonnet (GB) term in $ D > 4$ dimensions, and EGB gravity is topologically invariant in $4D$. Several ways have been proposed for regularizing the $ D \to 4 $ limit of EGB for non-trivial gravitational dynamics in $ 4D $. Motivated by the importance of AdS/CFT, we obtain an exact static spherically symmetric nonsingular black hole in $4D$ EGB gravity coupled to the nonlinear electrodynamics (NED) in an AdS spacetime. We interpret the negative cosmological constant $Λ$ as the positive pressure, via $ P=-Λ/8π$, of the system's thermodynamic properties of the nonsingular black hole with an AdS background. We find that for $P<P_c$, the black holes with $C_P>0$ are stable to thermal fluctuations and unstable otherwise. We also analyzed the Gibbs free energy to find that the small globally unstable black holes undergo a phase transition to the large globally stable black holes. Further, we study the $P-V$ criticality of the system and then calculate the critical exponents to find that our system behaves like Van der Walls fluid.

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。

↑