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Updated: Nov 26, 2025

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Multipole Ratios: A New Window into Black Holes
Iosif Bena1, Daniel R Mayerson1
1Institut de Physique Théorique, Université Paris-Saclay, CNRS, CEA, Orme des Merisiers 91191, Gif-sur-Yvette CEDEX, France.
Abstract:
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.
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