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arXiv 0709.2433gr-qchep-thmath-phmath.MP
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圈量子引力中黑洞熵量子化的解释

Toward explaining black hole entropy quantization in loop quantum gravity

Hanno Sahlmann

摘要:

在一次对圈量子引力中球对称黑洞的状态谱的数值分析中,科里奇、迪亚兹-波罗和费尔南德斯-博尔哈发现,黑洞视界的熵随着面积的增加而以类似于离散步骤的方式增加。在这篇文章中,我们重新制定的组合问题计数视界状态的路径通过一定的空间。这个公式揭示了熵的这种阶梯状行为的起源。特别是,使用一些额外的假设,我们得出一个公式,该公式将观察到的步长再现到百分之零点几的精度。然而,在我们的重新表述中,周期性最终是作为某种复杂过程的性质而出现的,而这种复杂过程的性质又以一种相当不透明的方式依赖于圈量子引力中的面积谱的性质。因此,从某种意义上说,对观测到的周期性仍然缺乏深入的解释。

英文摘要:

In a remarkable numerical analysis of the spectrum of states for a spherically symmetric black hole in loop quantum gravity, Corichi, Diaz-Polo and Fernandez-Borja found that the entropy of the black hole horizon increases in what resembles discrete steps as a function of area. In the present article we reformulate the combinatorial problem of counting horizon states in terms of paths through a certain space. This formulation sheds some light on the origins of this step-like behavior of the entropy. In particular, using a few extra assumptions we arrive at a formula that reproduces the observed step-length to a few tenths of a percent accuracy. However, in our reformulation the periodicity ultimately arises as a property of some complicated process, the properties of which, in turn, depend on the properties of the area spectrum in loop quantum gravity in a rather opaque way. Thus, in some sense, a deep explanation of the observed periodicity is still lacking.

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