Radiative gravastar with thermal spectrum: Sudden vacuum condensation without gravitational collapse
Radiative gravastar with thermal spectrum: Sudden vacuum condensation without gravitational collapse
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带有热谱的辐射格拉瓦星：没有引力塌缩的突然真空凝结
DOI：
10.1103/physrevd.107.084036
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发表时间：
2023
影响因子：
5
通讯作者：
Tomohiro Harada
中科院分区：
文献类型：
--
作者：
Ken-ichi Nakao;Kazumasa Okabayashi;Tomohiro Harada
引力星体是一种奇异的致密天体，被认为是一个大质量物体引力坍塌的最终产物，目的是解决与黑洞相关的问题。它被一层薄壳包裹着，内部被正的宇宙常数占据。最近，作者研究了通过球对称引力坍缩形成格拉伐他星的量子粒子产生，并证明了新形成的格拉伐他星以其德西特核的Gibbons-Hawking温度发射热辐射。在这篇文章中，为了更多地了解与格伐他星形成相关的热辐射，我们研究了另一种格伐他星形成的玩具模型中的量子粒子的产生：一颗内部中空的恒星通过引力真空凝聚突然变成了格瓦斯塔星。我们发现，热辐射也是从本模型中刚刚形成的格拉伐他星发出的。刚刚形成的引力星体的热辐射来自恒星内部几何结构的变化，并伴随着引力真空凝聚。
The gravastar is an exotic compact object proposed as a final product of the 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.