Transient scalar hair for nearly extreme black holes
Transient scalar hair for nearly extreme black holes
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DOI：
10.1103/physrevresearch.1.033106
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发表时间：
2019-06
影响因子：
4.2
通讯作者：
L. Burko;G. Khanna;S. Sabharwal
中科院分区：
文献类型：
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作者：
L. Burko;G. Khanna;S. Sabharwal
最近的研究表明，极端的Reissner-Nordstrom黑洞被最小耦合、自由、无质量的标量场扰动后，会有永久的标量头发。毛发--在黑洞的事件视界计算出的守恒电荷--可以通过未来零无限的某种表达式来测量：后者在时间上与毛发相反。我们将这种新发现的头发也推广到极端的克尔黑洞。我们研究了近极端黑洞头发的行为及其在未来零无穷远处作为瞬态现象的测量。对于接近极端的黑洞，在未来的零无穷远处，新长出的头发的长度在中间时刻随时间平方地减小，直到它的长度变短，并且长度缩短的速率进一步减慢。最后，接近极端的BH再次变得像非极端的BH一样光秃秃的。
It has been shown recently that extreme Reissner-Nordstrom black holes perturbed by a minimally coupled, free, massless scalar field have permanent scalar hair. The hair - a conserved charge calculated at the black hole's event horizon - can be measured by a certain expression at future null infinity: the latter approaches the hair inversely in time. We generalize this newly discovered hair also for extreme Kerr black holes. We study the behavior of nearly extreme black hole hair and its measurement at future null infinity as a transient phenomenon. For nearly extreme black holes the measurement at future null infinity of the length of the newly grown hair decreases quadratically in time at intermediate times until its length becomes short and the rate at which the length shortens further slows down. Eventually, the nearly extreme BH becomes bald again like non-extreme BHs.