Extreme lensing induces spectrotemporal correlations in black-hole signals

Shahar Hadar, Sreehari Harikesh, Doron Chelouche

Research output: Contribution to journalArticlepeer-review


Rapid progress in electromagnetic black-hole observation presents a theoretical challenge: how can the universal signatures of extreme gravitational lensing be distilled from stochastic astrophysical signals With this motivation, the two-point correlation function of specific intensity fluctuations across image positions, times, and frequencies is here considered. The contribution of strongly deflected light rays, those which make up the photon ring, is analytically computed for a Kerr black hole illuminated by a simple geometric-statistical emission model. We subsequently integrate over the image to yield a spectrotemporal correlation function that is relevant for unresolved sources. Finally, some observational aspects are discussed and a preliminary assessment of detectability with current and upcoming missions is provided.

Original languageAmerican English
Article number124057
JournalPhysical review D
Issue number12
StatePublished - 15 Jun 2023

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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