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arXiv 1106.2279gr-qc
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不同畴壁塌陷时温度和熵的时间演化

Time Evolution of Temperature and Entropy of Various Collapsing Domain Walls

Evan Halstead

摘要:

我们调查的温度和熵的引力坍缩畴壁所看到的渐近观测器的时间演化。特别是,我们试图了解拓扑结构和宇宙学常数的增加如何影响引力坍缩。以前的工作表明,球对称坍缩区域的熵接近常数。在本文中,我们重现了这些结果,使用全量子和半经典的方法,然后我们重复的过程中的德西特Schwarzschild域壁(球形与宇宙学常数)和(3+1)BTZ域壁(圆柱形)。我们通过将标量场耦合到畴壁的背景并分析作为时间函数的辐射谱来实现这一点。我们发现,频谱是准热的,随着畴壁接近视界,热化程度增加。的热分布允许确定的温度作为时间的函数,我们发现,后期的时间温度是非常接近的霍金温度,它也表现出适当的缩放与质量。从温度中我们得到熵。由于坍缩的畴壁是形成黑洞的原因,我们可以将结果与标准的熵-面积关系进行比较。我们发现,熵实际上接近一个常数,接近霍金熵。然而,德西特-史瓦西畴壁和(3+1)BTZ畴壁都显示出熵减小的周期,这表明自发坍缩可能被阻止。

英文摘要:

We investigate the time evolution of the temperature and entropy of gravitationally collapsing domain walls as seen by an asymptotic observer. In particular, we seek to understand how topology and the addition of a cosmological constant affect the gravitational collapse. Previous work has shown that the entropy of a spherically symmetric collapsing domain approaches a constant. In this paper, we reproduce these results, using both a fully quantum and a semi-classical approach, then we repeat the process for a de Sitter Schwarzschild domain wall (spherical with cosmological constant) and a (3+1) BTZ domain wall (cylindrical). We do this by coupling a scalar field to the background of the domain wall and analyzing the spectrum of radiation as a function of time. We find that the spectrum is quasi-thermal, with the degree of thermality increasing as the domain wall approaches the horizon. The thermal distribution allows for the determination of the temperature as a function of time, and we find that the late time temperature is very close to the Hawking temperature and that it also exhibits the proper scaling with the mass. From the temperature we find the entropy. Since the collapsing domain wall is what forms a black hole, we can compare the results to those of the standard entropy-area relation. We find that the entropy does in fact approach a constant that is close to the Hawking entropy. However, both the de Sitter Schwarzschild domain wall and the (3+1) BTZ domain wall show periods of decreasing entropy, which suggests that spontaneous collapse may be prevented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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