论文标题
轴诱导的角动量逆转在Kerr样黑洞中
Axion induced angular momentum reversal in Kerr-like black holes
论文作者
论文摘要
我们考虑了一个伪轴轴状场，该场耦合到Chern-Simons重力异常项。轴向场在旋转的Kerr黑洞背景上进行反射，从而导致时空的修改。为了确定潜在的可观察到的特征，我们研究了改良的Kerr样黑洞系统的角动量以及黑洞的地平线外的轴子物质。随着轴支球场与Chern-simons项的耦合的强度正在增加，因此系统的总角动量保持恒定的要求迫使黑洞角动量降低。存在这种耦合的临界值，超过该耦合，黑洞开始以相反的方向旋转，其角动量的幅度越来越大。我们将这种效果解释为轴心物质与重力异常之间的能量交换的结果，该作用是由旋转黑洞提供的。
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.
