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arXiv 2105.04577hep-th
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改进的矩阵黑洞实时蒸发的半经典模型

Improved semiclassical model for real time evaporation of Matrix black holes

David Berenstein, Yueshu Guan

摘要:

我们研究了受黑洞蒸发问题启发的简化$2\times 2$矩阵模型的实时经典矩阵力学。这是朝着建立黑洞实时蒸发的定量模型迈出的一步,黑洞在弦论中被实现为D 0-膜的束缚态。我们研究的模型是杨米尔斯在$2+1$维到$0+1$维的减少,这已被修正与额外的潜力,可以解释为一个零点的费米子的能量。我们的目标是了解这样一个经典的束缚态对象在经典制度的寿命。为此,我们特别注意D粒子何时分离,以检查矩阵的“非对角模式”是否变得绝热,并使用该信息来改进现有的蒸发模型。结果表明,在费米子修正下,寿命的朴素期望值是无穷大的。这是一个对数发散,它是由经典蒸发阈值附近膜之间的距离非常大的偏移引起的。绝热行为让我们在这个区域得到一些动力学的解析控制,以得到这个估计。由于绝热参数的量子化,这种发散在量子理论中被截断,导致束缚态的长寿命,具有$\log(1/\hbar)$阶的参数依赖性。

英文摘要:

We study real time classical matrix mechanics of a simplified $2\times 2$ matrix model inspired by the black hole evaporation problem. This is a step towards making a quantitative model of real time evaporation of a black hole, which is realized as a bound state of D0-branes in string theory. The model we study is the reduction of Yang Mills in $2+1$ dimension to $0+1$ dimensions, which has been corrected with an additional potential that can be interpreted as a zero point energy for fermions. Our goal is to understand the lifetime of such a classical bound state object in the classical regime. To do so, we pay particular attention to when D-particles separate to check that the "off diagonal modes" of the matrices become adiabatic and use that information to improve on existing models of evaporation. It turns out that the naive expectation value of the lifetime with the fermionic correction is infinite. This is a logarithmic divergence that arises from very large excursions in the separation between the branes near the threshold for classical evaporation. The adiabatic behavior lets us get some analytic control of the dynamics in this regime to get this estimate. This divergence is cutoff in the quantum theory due to quantization of the adiabatic parameter, resulting in a long lifetime of the bound state, with a parametric dependence of order $\log(1/\hbar)$.

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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