物理
虫洞
光子
光子球体
地平线
公制(单位)
轻型圆锥
球体
时空
数学物理
经典力学
量子力学
施瓦西半径
经济
天文
de Sitter–Schwarzschild公制
运营管理
作者
Joshua Baines,Matt Visser
出处
期刊:Physical review
日期:2023-12-01
卷期号:108 (12)
标识
DOI:10.1103/physrevd.108.124001
摘要
We consider the explicit analytic behavior of photon escape cones in generic static spherically symmetric spacetimes, emphasizing the interplay between the physical spacetime metric and the optical metric, and the interplay between large-distance asymptotic and near-horizon physics. The circular photon orbits (photon spheres) are shown to be given by wormhole throats in the optical metric, (not the physical metric), and the escape cone solid angle is easily calculable in terms of the capture cross section ${\ensuremath{\sigma}}_{\mathrm{capture}}$, the area of the spherical 2-surfaces, and the norm of the timelike Killing vector. Under appropriate circumstances, for near-horizon photon emission the escape cone solid angle can be related to the surface gravity ${\ensuremath{\kappa}}_{H}$. We provide a number of illustrative examples, involving both black holes and wormholes, including situations with multiple photon spheres.
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