论文标题
$ 4D $ EINSTEIN-GAUSS-BONNET黑洞的字符串云
Clouds of strings in $4D$ Einstein-Gauss-Bonnet black holes
论文作者
论文摘要
最近,已经显示出Einstein-Gauss-Bonnet(EGB)重力,通过将耦合常数重新定位为$α/(D-4)$,并在运动方程级别以$ 4D $ 4D $ 4D $ 4D $ 4D $ EGB GRAVITY的限制$ d \ rightArrow 4 $。我们向被弦云(CS)围绕的理论提供了精确的黑洞解决方案,并分析了其热力学特性,以计算黑洞质量,温度和熵的精确表达式。由于背景CS校正后的黑洞,除熵外,还校正了热力学量,该熵不受CS背景的影响。但是,由于新型$ 4D $ EGB理论的结果,Bekenstein-Hawking地区定律被证明是通过对数区域术语来纠正的。热容量$ c _+ $以临界半径$ r = r_c $分化,顺便说一句,即使在没有宇宙学术语的情况下,温度也有最高的温度,而鹰页面的过渡也是$ c_+> 0 $的$ r_+ <r_c $,允许黑洞允许黑孔变得热力稳定。此外,较小的黑洞是全球优先的,负自由能$ f _+<0 $。我们的解决方案也可以确定为$ 4D $单极收费的EGB黑洞。我们重新获得了一般相对性的球形对称黑洞解决方案和新颖$ 4D $ EGB的结果,以$α\至0 $和$ a = 0 $。
Recently it has been shown that the Einstein-Gauss-Bonnet (EGB) gravity, by rescaling the coupling constant as $α/(D-4)$ and taking the limit $D \rightarrow 4$ at the level of the equations of motion, becomes nontrivially ghost-free in $4D$ - namely the novel $4D$ EGB gravity. We present an exact charged black hole solution to the theory surrounded by clouds of string (CS) and also analyze their thermodynamic properties to calculate exact expressions for the black hole mass, temperature, and entropy. Owing to the corrected black hole due to the background CS, the thermodynamic quantities have also been corrected except for the entropy, which remains unaffected by a CS background. However, as a result of the novel $4D$ EGB theory, the Bekenstein-Hawking area law turns out to be corrected by a logarithmic area term. The heat capacity $C_+$ diverges at a critical radius $r=r_C$, where incidentally the temperature has a maximum, and the Hawking-Page transitions even in absence of the cosmological term and $C_+ > 0$ for $r_+ < r_C$ allowing the black hole to become thermodynamically stable. In addition, the smaller black holes are globally preferred with negative free energy $F_+<0$. Our solution can also be identified as a $4D$ monopole-charged EGB black hole. We regain results of spherically symmetric black hole solutions of general relativity and that of novel $4D$ EGB, respectively, in the limits $α\to 0$ and $a=0$.