Robustness of particle creation in the formation of a compact object
Robustness of particle creation in the formation of a compact object
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致密物体形成过程中粒子产生的鲁棒性
DOI：
10.1093/ptep/ptac006
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Ken-ichi Nakao
中科院分区：
文献类型：
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作者：
Kazumasa Okabayashi;Tomohiro Harada;Ken-ichi Nakao
霍金预言，由引力崩塌形成的黑洞会导致量子粒子的产生，粒子的光谱几乎是热的。这种现象被称为霍金辐射。最近，有人预测，如果引力崩塌在事件视界形成之前突然停止，粒子的产生可能会从霍金辐射急剧转变为强烈的双爆发。与霍金辐射相比，这种爆发可能非常强烈，即使对于具有天体物理质量尺度的坍塌物体，它也可以引起观测兴趣。然而，通过对理想化模型的研究，已经预测到了爆炸现象。在理想模型中，球形中空壳开始坍塌，但停止收缩，最终稳定下来，形成一颗静态的“恒星”。因此，人们可能会猜测，这可能是中空壳模型所特有的。在这篇文章中，我们研究了内部充满物质的球形物体由于引力坍塌而产生的粒子。在该模型中，我们得到了与中空壳模型类似的结果。这意味着双重爆发是引力崩塌的突然刹车所产生的粒子的一种强健特性。
Hawking predicted that the formation of a black hole by gravitational collapse causes quantum particle creation and the spectrum of the particles is almost thermal. This phenomenon is called Hawking radiation. Recently, it has been predicted that particle creation may drastically change from Hawking radiation to a strong double burst if the gravitational collapse suddenly stops just before the formation of the event horizon. In contrast with Hawking radiation, the burst may be so strong that it can be of observational interest even for collapsing objects with astrophysical mass scales. However, the burst phenomenon has been predicted through studies of idealized models in which a spherical hollow shell begins to collapse, but stops shrinking and eventually settles down to a static “star”. Therefore, one might guess that it could be particular to the hollow shell model. In this paper, we study particle creation due to the gravitational collapse of a spherical object whose interior is filled with matter. In this model, we obtain similar results to those in the case of the hollow shell model. This implies that the double burst is a robust property of particle creation by the sudden braking of gravitational collapse.