Light curve of a hotspot on equatorial orbit around Kerr black hole surrounded by reflective firewall

TL;DR

This paper analyzes the light curve of a bright spot orbiting a Kerr black hole to identify potential signatures of a reflective firewall, revealing increased flux and prolonged radiation in the presence of a firewall.

Contribution

It introduces a model to distinguish the effects of a reflective firewall on the light curve of orbiting spots around Kerr black holes.

Findings

Increased total observed flux with a firewall.

Longer duration of radiation signals with a firewall.

Potential observational signatures of black hole firewalls.

Abstract

The light curve of an isolated bright spot in a Keplarian orbit is studied to investigate the signature of the firewall around the event horizon of the black hole. An increase in total observed flux is found. In addition to that, for firewall case comparatively a longer time radiation is observed.