Photon Emission Near Extreme Kerr Black Holes

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.

arXiv comment12 pages, v2: equations fixed, reference added

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• Influence of a plasma on the observational signature of a high-spin Kerr black hole
• Revisiting the shadow of braneworld black holes
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• Visible shapes of black holes M87* and SgrA*
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