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arXiv 1909.07968gr-qcastro-ph.HEhep-ph
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内寄生黑洞的中子星的命运及其对暗物质的影响

Fate of a neutron star with an endoparasitic black hole and implications for dark matter

William E. East, Luis Lehner

摘要:

我们研究了中子星被恒星内部质量小得多的黑洞吞噬的动力学和观测特征。这种现象可能会出现在各种场景中,包括捕获原始黑洞之后,或者在一些不对称暗物质模型中,暗物质粒子聚集在中子星的中心,最终坍塌形成黑洞。然而,中子星如何坍缩的细节还不为人所知,这对于确定此类事件的观测意义至关重要。我们充分利用广义相对论模拟来跟踪这样一个黑洞的演化,因为它增长了几个数量级,并最终消耗了中子星。我们考虑一系列的自旋值的中子星,从非旋转的恒星,那些与毫秒周期,以及不同的状态方程。我们发现,随着黑洞的增长,它获得了一个不可忽略的自旋,并在中子星的核心诱导微分旋转。与以前的研究相比,我们发现,即使是快速旋转的恒星,动态喷出物的量也非常小,这抑制了从此类事件中产生千诺瓦型电磁信号的前景。我们评论其他可能的电磁和引力信号。

英文摘要:

We study the dynamics and observational signatures of a neutron star being consumed by a much less massive black hole residing inside the star. This phenomenon could arise in a variety of scenarios, including after the capture of a primordial black hole, or in some models of asymmetric dark matter where the dark matter particles collect at the center of a neutron star and eventually collapse to form a black hole. However, the details of how the neutron star implodes are not well known, which is crucial to determining the observational implications of such events. We utilize fully general relativistic simulations to follow the evolution of such a black hole as it grows by several orders of magnitude, and ultimately consumes the neutron star. We consider a range of spin values for the neutron star, from non-rotating stars, to those with millisecond periods, as well as different equations of state. We find that as the black hole grows, it obtains a non-negligible spin and induces differential rotation in the core of the neutron star. In contrast to previous studies, we find that the amount of dynamical ejecta is very small, even for rapidly rotating stars, dampening the prospects for producing a kilonova-type electromagnetic signal from such events. We comment on other possible electromagnetic and gravitational signals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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