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arXiv 2106.01966hep-thgr-qc
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黑洞背景下引力的量子化

Quantization of Gravity in the Black Hole Background

Renata Kallosh, Adel A. Rahman

摘要:

我们在史瓦西黑洞背景下对微扰引力进行了协变(拉格朗日)量子化。关键的工具是将场分解成球谐函数。对于角动量量子数为$l \geq 2$的模,我们固定Regge-Wheeler规范;对于角动量量子数为$l$ $=$ $0$或$1$的低多极模,我们提出了一组规范固定条件,它们是二维背景协变的,并且是微扰定义的.我们发现,相应的Faddeev-Popov鬼是非传播的$l\geq2$模式,但在一般的非平凡的低多极模式与$l = 0,1$。然而,在Schwarzschild坐标系中,所有作用于鬼的时间导数都从作用中下降,并且低多极鬼具有瞬时传播子。在有视界的空间中量子化引力的可能的微妙之处,法捷耶夫定理暗示了在一个明显没有幽灵的希尔伯特空间中潜在的正则(哈密顿)量子化的可能性。

英文摘要:

We perform a covariant (Lagrangian) quantization of perturbative gravity in the background of a Schwarzschild black hole. The key tool is a decomposition of the field into spherical harmonics. We fix Regge-Wheeler gauge for modes with angular momentum quantum number $l \geq 2$, while for low multipole modes with $l$ $=$ $0$ or $1$ -- for which Regge-Wheeler gauge is inapplicable -- we propose a set of gauge fixing conditions which are 2D background covariant and perturbatively well-defined. We find that the corresponding Faddeev-Popov ghosts are non-propagating for the $l\geq2$ modes, but are in general nontrivial for the low multipole modes with $l = 0,1$. However, in Schwarzschild coordinates, all time derivatives acting on the ghosts drop from the action and the low multipole ghosts have instantaneous propagators. Up to possible subtleties related to quantizing gravity in a space with a horizon, Faddeev's theorem suggests the possibility of an underlying canonical (Hamiltonian) quantization with a manifestly ghost-free Hilbert space.

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