Bena Iosif, Mayerson Daniel R
Institut de Physique Théorique, Université Paris-Saclay, CNRS, CEA, Orme des Merisiers 91191, Gif-sur-Yvette CEDEX, France.
Phys Rev Lett. 2020 Nov 27;125(22):221602. doi: 10.1103/PhysRevLett.125.221602.
We compute the gravitational multipole moments and ratios of moments of nonextremal and of supersymmetric black holes in four dimensions, as well as of horizonless microstate geometries of the latter. For supersymmetric and for Kerr black holes many of these multipole moments vanish, and their dimensionless ratios are ill defined. We present two methods to compute these dimensionless ratios, which for certain supersymmetric black holes agree surprisingly well. We also compute these dimensionless ratios for the Kerr solution. Our methods allow us to calculate an infinite number of hitherto unknown parameters of Kerr black holes, giving us a new window into their physics.
我们计算了四维非极值黑洞和超对称黑洞的引力多极矩以及矩的比率，还有后者的无视界微观态几何结构的相关量。对于超对称黑洞和克尔黑洞，其中许多多极矩为零，并且它们的无量纲比率定义不明确。我们提出了两种计算这些无量纲比率的方法，对于某些超对称黑洞，这两种方法的结果惊人地吻合。我们还计算了克尔解的这些无量纲比率。我们的方法使我们能够计算出克尔黑洞许多迄今未知的参数，为我们了解其物理性质打开了一扇新窗口。
