Radiative gravastar with Gibbons-Hawking temperature

Abstract

We study the quantum particle creation in a toy model of spherically symmetric gravitational collapse whose final product is not a black hole but a gravastar. Precedent studies revealed that even in the case of the gravitational collapse to form a horizonless ultra-compact object, thermal radiation named transient Hawking radiation is generated at the late stage of the gravitational collapse, and a sudden stop of collapsing motion to form a horizonless ultra-compact object causes one or two bursts of quantum particle creation. The very different behavior of the model studied in this paper from the precedent ones is quantum radiation with a thermal spectrum from the gravastar between two bursts. The temperature of the radiation is not the same as the Hawking one determined by the gravitational mass of the system but the Gibbons-Hawking one of the de Sitter core inside the gravastar.

Revised version with 33 pages, 3 figures

References in corpus (4)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• Tests for the existence of horizons through gravitational wave echoes
• Hawking-like radiation from evolving black holes and compact horizonless objects
• Robustness of particle creation in the formation of a compact object

Cited by in corpus (5)

• Solitonic Gravastars in a U(1) gauge Higgs model
• Radiative gravastar with thermal spectrum; Sudden vacuum condensation without gravitational collapse
• Shadow formation in gravitational collapse: Redshift and blueshift by spacetime dynamics
• Thermodynamic analysis of a compact object in Rastall-Rainbow gravity
• Macroscopic backreaction of the trace anomaly on classical vacuum backgrounds