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arXiv 2109.00564gr-qcastro-ph.HEhep-th
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无反射对称旋转黑洞周围的弯曲吸积盘

Curved accretion disks around rotating black holes without reflection symmetry

Che-Yu Chen, Hsiang-Yi Karen Yang

摘要:

在基本量子引力的有效低能理论中,特别是在引入宇称违反相互作用时,自然会出现没有赤道反射对称性的旋转黑洞。采用理论不可知的方法,考虑最近提出的类Kerr-like黑洞模型,研究了无反射对称旋转黑洞周围吸积盘的结构和性质.在没有反射对称性的情况下,吸积盘通常是曲面形状,而不是位于赤道面上的平盘。此外,控制反射不对称性的参数$ε$将缩小最内层稳定圆轨道的尺寸,并提高黑洞在吸积过程中将静止质量能量转换为辐射的效率。逆行最内侧的稳定圆形轨道被拉伸,但其影响基本上被抑制。此外,我们发现,自旋测量的基础上的引力红移观测的磁盘,假设一个克尔几何,可能高估了真实的自旋值,如果中心对象实际上是一个克尔类黑洞与明显的赤道反射不对称性。当反射不对称性较小时,吸积盘弯曲,最内层稳定圆轨道收缩的定性结果在我们的模型中是普遍的。

英文摘要:

Rotating black holes without equatorial reflection symmetry can naturally arise in effective low-energy theories of fundamental quantum gravity, in particular, when parity-violating interactions are introduced. Adopting a theory-agnostic approach and considering a recently proposed Kerr-like black hole model, we investigate the structure and properties of accretion disk around a rotating black hole without reflection symmetry. In the absence of reflection symmetry, the accretion disk is in general a curved surface in shape, rather than a flat disk lying on the equatorial plane. Furthermore, the parameter $ε$ that controls the reflection asymmetry would shrink the size of the prograde innermost stable circular orbits, and enhance the efficiency of the black hole in converting rest-mass energy to radiation during accretion. The retrograde innermost stable circular orbits are stretched but the effects are substantially suppressed. In addition, we find that spin measurements based on the gravitational redshift observations of the disk, assuming a Kerr geometry, may overestimate the true spin values if the central object is actually a Kerr-like black hole with conspicuous equatorial reflection asymmetry. The qualitative results that the accretion disk becomes curved and the prograde innermost stable circular orbits are shrunk turn out to be generic in our model when the reflection asymmetry is small.

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