Quasistationary solutions of self-gravitating scalar fields around collapsing stars

被引:24
作者
Sanchis-Gual, Nicolas [1 ]
Carlos Degollado, Juan [2 ]
Montero, Pedro J. [3 ]
Font, Jose A. [1 ,4 ]
Mewes, Vassilios [1 ]
机构
[1] Univ Valencia, Dept Astron & Astrofis, E-46100 Burjassot, Valencia, Spain
[2] Univ Guadalajara, Ctr Univ Ciencias Exactas & Ingn, Dept Ciencias Computac, Guadalajara 44430, Jalisco, Mexico
[3] Max Planck Inst Astrophys, D-85748 Garching, Germany
[4] Univ Valencia, Astron Observ, Paterna 46980, Valencia, Spain
来源
PHYSICAL REVIEW D | 2015年 / 92卷 / 08期
关键词
SUPERMASSIVE BLACK-HOLES; DARK-MATTER; EVOLUTION; REDSHIFT;
D O I
10.1103/PhysRevD.92.083001
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Recent work has shown that scalar fields around black holes can form long-lived, quasistationary configurations surviving for cosmological time scales. Scalar fields thus cannot be discarded as viable candidates for dark matter halo models in galaxies around central supermassive black holes (SMBHs). One hypothesized formation scenario of most SMBHs at high redshift is the gravitational collapse of supermassive stars (SMSs) with masses of similar to 10(5) M-circle dot. Any such scalar field configurations must survive the gravitational collapse of a SMS in order to be a viable model of physical reality. To check for the postcollapse survival of these configurations and to follow the dynamics of the black hole-scalar field system 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 nonrotating black holes after the collapse of the stars.
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页数:16
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