Corrected Thermodynamics of Black Holes in f(R) Gravity with Electrodynamic Field and Cosmological Constant

被引:2
作者
Xu, Mou [1 ]
Zhang, Yuying [1 ]
Yang, Liu [1 ]
Yang, Shining [1 ]
Lu, Jianbo [1 ]
机构
[1] Liaoning Normal Univ, Dept Phys, Dalian 116029, Peoples R China
基金
中国国家自然科学基金;
关键词
f(R) theory; corrected entropy; corrected black hole thermodynamics; stability; LOGARITHMIC CORRECTIONS; HOLOGRAPHIC PRINCIPLE; INFLATION; UNIVERSE; ENTROPY; WAVES;
D O I
10.3390/e26100868
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The thermodynamics of black holes (BHs) and their corrections have become a hot topic in the study of gravitational physics, with significant progress made in recent decades. In this paper, we study the thermodynamics and corrections of spherically symmetric BHs in models f(R)=R+alpha R2 and f(R)=R+2 gamma R+8 Lambda under the f(R) theory, which includes the electrodynamic field and the cosmological constant. Considering thermal fluctuations around equilibrium states, we find that, for both f(R) models, the corrected entropy is meaningful in the case of a negative cosmological constant (anti-de Sitter-RN spacetime) with Lambda=-1. It is shown that when the BHs' horizon radius is small, thermal fluctuations have a more significant effect on the corrected entropy. Using the corrected entropy, we derive expressions for the relevant corrected thermodynamic quantities (such as Helmholtz free energy, internal energy, Gibbs free energy, and specific heat) and calculate the effects of the correction terms. The results indicate that the corrections to Helmholtz free energy and Gibbs free energy, caused by thermal fluctuations, are remarkable for small BHs. In addition, we explore the stability of BHs using specific heat. The study reveals that the corrected BH thermodynamics exhibit locally stable for both models, and corrected systems undergo a Hawking-Page phase transition. Considering the requirement on the non-negative volume of BHs, we also investigate the constraint on the EH radius of BHs.
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页数:17
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