Radiative gravastar with thermal spectrum; Sudden vacuum condensation without gravitational collapse
Abstract
The gravastar is an exotic compact object proposed as a final product of gravitational collapse of a massive object in order to resolve problems associated with black holes. It is enclosed by a thin crust and the inside of it is occupied by the positive cosmological constant. Recently, the present authors studied quantum particle creation through spherically symmetric gravitational collapse to form a gravastar, and showed that the newly formed gravastar emits thermal radiation with the Gibbons-Hawking temperature of its de Sitter core. In this paper, in order to understand more about the thermal radiation associated with the gravastar formation, we investigate the quantum particle creation in another toy model of the gravastar formation; a star with the hollow inside suddenly becomes a gravastar through gravitational vacuum condensation. We find that the thermal radiation is emitted from the gravastar just formed also in the present model. The thermal radiation from the gravastar just formed comes from the change of the geometry inside the star accompanied by gravitational vacuum condensate.
Keywords
Cite
@article{arxiv.2211.13477,
title = {Radiative gravastar with thermal spectrum; Sudden vacuum condensation without gravitational collapse},
author = {Ken-ichi Nakao and Kazumasa Okabayashi and Tomohiro Harada},
journal= {arXiv preprint arXiv:2211.13477},
year = {2023}
}
Comments
22 pages, 2 figures. arXiv admin note: text overlap with arXiv:2203.14519. Discussions about the temperature of the radiation are added in the revised version