Quasistationary solutions of self-gravitating scalar fields around collapsing stars
Quasistationary solutions of self-gravitating scalar fields around collapsing stars
复制标题
塌缩恒星周围自引力标量场的准稳态解
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
V. Mewes
中科院分区：
文献类型：
--
作者：
N. Sanchis;J. C. Degollado;P. J. Montero;J. Font;V. Mewes
最近的工作表明，黑洞周围的标量场可以形成在宇宙学时间尺度上生存的长寿、准稳态配置。有了这个要求，标量场不能被丢弃作为中心超大质量黑洞（SMBH）周围星系中暗物质晕模型的可行候选者。对于大多数高红移的超大质量黑洞的形成，有一种假设是质量为105的超大质量恒星（SMS）的引力坍缩
m {M_{odot}}$。因此，标量场的准束缚态存在的一个约束条件是它们对这种动力学事件的生存。为了回答这个问题，我们在本文中提出了一系列对被自引力纯量场包围的引力坍缩球对称恒星进行的数值相对论模拟的结果。我们使用一个理想的流体状态方程与绝热指数伽玛=4/3$，这是足够的模拟辐射为主的等熵SMSs。我们的结果证实了恒星坍缩后，非旋转黑洞周围存在振荡的、长寿命的、自引力标量场结构。
Recent work has shown that scalar fields around black holes can form long-lived, quasistationary configurations surviving for cosmological timescales. With this requirement, scalar fields cannot be discarded as viable candidates for dark matter halo models in galaxies around central supermassive black holes (SMBH). One hypothesis for the formation of most SMBHs at high redshift is the gravitational collapse of supermassive stars (SMS) with masses of $sim10^5
m {M_{odot}}$. Therefore, a constraint for the existence of quasi-bound states of scalar fields is their survival to such dynamic events. To answer this question we present in this paper the results of a series of numerical relativity simulations of gravitationally collapsing, spherically symmetric stars surrounded by self-gravitating scalar fields. We use an ideal fluid equation of state with adiabatic index $Gamma=4/3$ which is adequate to simulate radiation-dominated isentropic SMSs. Our results confirm the existence of oscillating, long-lived, self-gravitating scalar field configurations around non-rotating black holes after the collapse of the stars.