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arXiv 1208.6367hep-thgr-qc
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不同维数下具有Gauss-Bonnet修正的弦论中的带电黑洞

Charged Black Holes in String Theory with Gauss-Bonnet Correction in Various Dimensions

Nobuyoshi Ohta, Takashi Torii

摘要:

本文利用杂化弦的低能有效理论Einstein-Gauss-Bonnet理论,研究了带电黑洞解。时空是D维的,并且假设是静态的,与$(D-2)$维常曲率空间球对称,并且是渐近平坦的。基本方程组是复杂的,数值求解。我们确定了允许的参数区域存在的黑洞解,并显示在D=4 - 6和10的场函数的配置。给出了黑洞的视界半径、质量、温度等物理量之间的关系,得到了几个结果。允许的参数区域的形式根据尺寸而不同。在我们选取的参数范围内,不存在T=0的极端黑洞解,它可以通过取非极端解的极限而得到。黑洞的熵在双光子理论中总是比在非双光子理论中大。我们的分析包括了高阶项,这是我们以前的工作中没有的。它的效果显着地出现在五个维度上,并在附录中给出。通过分析发现,黑洞解的性质强烈地依赖于量子场的维数、电荷和存在性。因此,对各个系统的详细分析和从系统的角度进行的调查都是重要的。

英文摘要:

We study charged black hole solutions in Einstein-Gauss-Bonnet theory with the dilaton field which is the low-energy effective theory of the heterotic string. The spacetime is D-dimensional and assumed to be static and spherically symmetric with the $(D-2)$-dimensional constant curvature space and asymptotically flat. The system of the basic equations is complex and the solutions are obtained numerically. We identify the allowed parameter region where the black hole solutions exist, and show configurations of the field functions in D=4 -- 6 and 10. We also show the relations of the physical quantities of the black holes such as the horizon radius, the mass, the temperature, and so on, and find several results. The forms of the allowed parameter regions are different depending on the dimension. There is no extreme black hole solution with T=0 that can be obtained by taking the limit of the non-extreme solutions within the parameter range we chose. Entropy of the black holes in the dilatonic theory is always larger than that in the non-dilatonic theory. Our analysis includes the higher order term of the dilaton field which is not in our previous works. Its effect remarkably appears in five dimensions and is given in the appendix. By our analysis it is found that the properties of the black hole solutions strongly depend on the dimension, charge, existence of the dilaton field. Hence both the detailed analyses of the individual systems and the investigations from the systematic point of view are important.

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