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arXiv 2202.00679hep-thgr-qc
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量子极值岛的简化,第IV部分:膜上的大质量黑洞

Quantum Extremal Islands Made Easy, Part IV: Massive Black Holes on the Brane

Guglielmo Grimaldi, Juan Hernandez, Robert C. Myers

摘要:

我们研究了具有非零质量的二维永恒黑洞,其中每个渐近边界与圆上的CFT接触,遵循[arXiv:2006.04851,arXiv:2010.00018,arXiv:2010.16398]中构建的双全息膜世界模型。我们计算了黑洞(或浴CFTs)的Page曲线,这相当于在体BTZ几何中找到了一个Randall-Sundrum膜落入黑洞的不同测地线。我们还探讨了可能性,包括一个内在的JT引力作用在膜上。正如预期的那样,广义熵在早期线性上升。然而,有一个过渡到后期阶段,其中熵保持不变。后期熵的值取决于热浴的大小。对于小尺寸,它对应于浴的热熵,而对于大尺寸,它对应于黑洞视界熵的两倍。临界尺寸和Page时间与共形缺陷的中心荷与熔池CFT的比值成正比。

英文摘要:

We study two-dimensional eternal black holes with non-zero mass, where each asymptotic boundary is in contact with a CFT on a circle, following the doubly holographic braneworld models constructed in [arXiv:2006.04851, arXiv:2010.00018, arXiv:2010.16398]. We compute the Page curve of the black hole (or the bath CFTs), which amounts to finding different geodesics in the bulk BTZ geometry with a Randall-Sundrum brane falling into the black hole. We also explore the possibility of including an intrinsic JT gravity action on the brane. As expected, the generalized entropy rises linearly at early times. However, there is a transition to a late-time phase in which the entropy remains constant. The value of the late-time entropy depends on the size of the thermal baths. For a small size, it corresponds to the thermal entropy of the baths, while for large size, it corresponds to twice the horizon entropy of the black hole. The critical size and the Page time are proportional to ratio of the central charges of the conformal defect and the bath CFT.

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