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arXiv 2203.07780gr-qchep-th
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Kerr黑洞内部量子标量场的两点函数

Two-point function of a quantum scalar field in the interior region of a Kerr black hole

Noa Zilberman, Marc Casals, Amos Ori, Adrian C. Ottewill

摘要:

量子场对经典背景时空的影响可以从广义相对论的半经典方程出发,以量子场的应力-能量张量的期望值为源得到。这个期望值可以从阿达玛的初等两点函数中计算出来,实际上是在两个时空点上计算的场模的乘积之和。导出了Kerr黑洞时空中Unruh态无质量标量场的两点函数表达式。本文的主要结果是当两点位于黑洞内部时,得到了一个新的有效表达式;我们还用一种新的方法重新推导了当两点位于黑洞外部时的有效表达式。我们实现这些表达式通过找到Unruh模式之间的关系,定义在延迟Kruskal坐标,和爱丁顿模式,定义在爱丁顿坐标。虽然我们的两点函数的起始表达式是用Unruh模式写成的,但我们给出了爱丁顿模式的最终表达式,爱丁顿模式具有计算优势,它们可以分解为服从常微分方程的因子。在附录中,我们还推导出表达式的裸模的贡献的应力-能量张量的通量分量的最小耦合无质量标量场内的黑洞。因此,我们的结果奠定了基础,为未来的克尔黑洞内的量子效应的计算。

英文摘要:

Quantum field effects on a classical background spacetime may be obtained from the semiclassical equations of General Relativity with the expectation value of the stress-energy tensor of the quantum field as a source. This expectation value can be calculated from Hadamard's elementary two-point function, which in practice is given in terms of sums of products of field modes evaluated at two spacetime points. We derive expressions for the two-point function for a massless scalar field in the Unruh state on a Kerr black hole spacetime. Our main result in this paper is a novel expression valid when the two points lie inside the black hole; we also (re-)derive, using a new method, the known expression valid when the two points lie outside the black hole. We achieve these expressions by finding relationships between Unruh modes, defined in terms of the retarded Kruskal coordinate, and Eddington modes, defined in terms of the Eddington coordinates. While our starting expression for the two-point function is written in terms of the Unruh modes, we give our final expression in terms of the Eddington modes, which have the computational advantage that they decompose into factors that obey ordinary differential equations. In an appendix we also derive expressions for the bare mode contributions to the flux components of the stress-energy tensor for a minimally-coupled massless scalar field inside the black hole. Our results thus lay the groundwork for future calculations of quantum effects inside a Kerr black hole.

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