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arXiv 1306.1546hep-thgr-qc
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渐近安全黑洞的结构问题

Structural aspects of asymptotically safe black holes

Benjamin Koch, Frank Saueressig

摘要:

本文研究了经典球对称Schwarzschild(Anti-)de Sitter黑洞在量子爱因斯坦引力下的量子变形。量子效应通过运行耦合常数$G_k$和$Λ_k$,精确的重整化群的方法内计算,和一个共同的规模设置程序。我们发现,与一般的直觉相反,实际上是宇宙学常数决定了RG改进的黑洞的短程结构:在渐近UV中,量子解的结构是普适的,由经典Schwarzschild-de Sitter解给出,这意味着经典和量子区域之间的自相似性。结果,渐近安全的黑洞完全蒸发,没有普朗克尺度的残余物形成。此外,临界Nariai-黑洞的热力学熵与基于有效平均作用量的微观态数一致,表明熵起源于平均场几何的量子涨落.

英文摘要:

We study the quantum modifications of classical, spherically symmetric Schwarzschild (Anti-) de Sitter black holes within Quantum Einstein Gravity. The quantum effects are incorporated through the running coupling constants $G_k$ and $Λ_k$, computed within the exact renormalization group approach, and a common scale-setting procedure. We find that, in contrast to common intuition, it is actually the cosmological constant that determines the short-distance structure of the RG-improved black hole: in the asymptotic UV the structure of the quantum solutions is universal and given by the classical Schwarzschild-de Sitter solution, entailing a self-similarity between the classical and quantum regime. As a consequence asymptotically safe black holes evaporate completely and no Planck-size remnants are formed. Moreover, the thermodynamic entropy of the critical Nariai-black hole is shown to agree with the microstate count based on the effective average action, suggesting that the entropy originates from quantum fluctuations around the mean-field geometry.

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