On Stimulated Radiation of Black Holes

TL;DR

This paper explores how black holes can stimulate particle radiation through the Unruh thermal state, potentially leading to observable photon and neutrino emissions from particle decays near the event horizon.

Contribution

It introduces a mechanism for stimulated radiation near black holes based on the Unruh effect, highlighting potential observable signals from gravitationally interacting particles.

Findings

Black holes can induce particle radiation via the Unruh thermal state.

Decay of hadronic particles produces gamma rays around 30 MeV.

Potential for detecting black hole-induced radiation through gamma and neutrino signals.

Abstract

The Unruh's thermal state in the vicinity of the event horizon of the black hole provides conditions where impinging particles can radiate other particles. The subsequent decays may eventually lead to observable radiation of photons and neutrinos induced even by massive particles with gravitational interaction only. The hadronic particles will induce $\sim 30$ MeV gamma radiation from $\pi^{0}$ decays.