Photon Emission Near Extreme Kerr Black Holes
arXiv:1607.06028 · doi:10.1103/PhysRevD.95.064009
Abstract
Ongoing astronomical efforts extract physical properties of black holes from electromagnetic emissions in their near-vicinity. This requires finding the null geodesics which extend from the near-horizon region out to a distant observatory. In general these can only be found numerically. In this paper, for the interesting special case of extremally spinning Kerr black holes, we use an emergent near-horizon conformal symmetry to find near-superradiant geodesics analytically.
12 pages, v2: equations fixed, reference added
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- Photon Emission Near Myers-Perry Black Holes in the Large Dimension Limit
- Spins of supermassive black holes M87* and SgrA* revealed from the size of dark spots in Event Horizon Telescope Images
- Null geodesics in extremal Kerr-Newman black holes
- Photon emission of extremal Kerr-Newman black holes
- Gravitational Lensing in the Kerr Spacetime: An Analytic Approach for Light and High-Frequency Gravitational Waves
- Examining the Kerr Metric through Wave Fronts of Null Geodesics