Axion induced angular momentum reversal in Kerr-like black holes
Axion induced angular momentum reversal in Kerr-like black holes
复制标题
类克尔黑洞中轴子引起的角动量反转
DOI：
10.1103/physrevd.106.084002
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发表时间：
2022
影响因子：
5
通讯作者：
E. Papantonopoulos
中科院分区：
文献类型：
--
作者：
Nikos Chatzifotis;Panos Dorlis;N. Mavromatos;E. Papantonopoulos
我们考虑一个耦合到Chern-Simons引力反常项的赝标类轴子场。轴子场在旋转的克尔黑洞背景上发生反作用，导致时空的修改。为了确定潜在的可观测特征，我们研究了修正的艾德克尔类黑洞和黑洞视界外的轴子物质系统的角动量.随着轴子场与陈-西蒙斯项耦合的强度增加，系统的总角动量保持不变的要求迫使黑洞的角动量减小。这种耦合存在一个临界值，超过这个临界值，黑洞开始向相反的方向旋转，其角动量的大小不断增加。我们解释这一现象的结果之间的交换能量的轴子物质和引力异常，这是由旋转黑洞的来源。
We consider a pseudoscalar axion-like field coupled to a Chern-Simons gravitational anomaly term. The axion field backreacts on a rotating Kerr black hole background, resulting in modifications in the spacetime. In an attempt to determine potentially observable signatures, we study the angular momentum of the system of the modified Kerr-like black hole and the axionic matter outside the horizon of the black hole. As the strength of the coupling of the axion field to the Chern-Simons term is increasing, the requirement that the total angular momentum of the system remain constant forces the black hole angular momentum to decrease. There exists a critical value of this coupling beyond which the black hole starts to rotate in the opposite direction, with an increasing magnitude of its angular momentum. We interpret this effect as a consequence of the exchange of energy between the axionic matter and the gravitational anomaly, which is sourced by the rotating black hole.