Black hole multipoles in higher-derivative gravity

Author:

Cano Pablo A.,Ganchev BogdanORCID,Mayerson Daniel R.,Ruipérez Alejandro

Abstract

Abstract We consider a broad family of higher-derivative extensions of four-dimensional Einstein gravity and study the multipole moments of rotating black holes therein. We carefully show that the various definitions of multipoles carry over from general relativity, and compute these multipoles for higher-derivative Kerr using the ACMC expansion formalism. We obtain the mass Mn and current Sn multipoles as a series expansions in the dimensionless spin; in some cases we are able to resum these series into closed-form expressions. Moreover, we observe the existence of intriguing relations between the corrections to the parity-odd multipoles S2n ≠ 0 and M2n+1 ≠ 0 that break equatorial symmetry, and the parity-preserving corrections that only modify S2n+1 and M2n. Further, we comment on the higher-derivative corrections to multipole ratios for Kerr, and we discuss the phenomenological implications of the corrections to the multipole moments for current and future gravitational wave experiments.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

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