Photon Emission Near Extreme Kerr Black Holes

Understand

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.