Radiative gravastar with Gibbons-Hawking temperature

TL;DR

This paper investigates quantum radiation from a gravastar model, revealing a thermal spectrum with Gibbons-Hawking temperature, differing from traditional Hawking radiation in black hole formation.

Contribution

It introduces a novel gravastar model exhibiting quantum radiation with Gibbons-Hawking temperature, contrasting previous models with transient Hawking radiation.

Findings

Quantum radiation with Gibbons-Hawking temperature emitted from gravastar.

Radiation spectrum differs from Hawking radiation of black holes.

Distinct quantum particle creation behavior in gravastar formation.

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.