Supergravity Black Holes, Love Numbers and Harmonic Coordinates

TL;DR

This paper investigates supergravity black hole metrics, calculating Love numbers and harmonic coordinates, revealing that certain solutions share properties with Kerr black holes and exhibit specific symmetries in low-frequency limits.

Contribution

It demonstrates that a class of supergravity black hole solutions have harmonic coordinates identical to Kerr and exhibit Kerr-like symmetries in the low-frequency regime.

Findings

Harmonic coordinates of supergravity black holes match Kerr solutions.

Scalar fields show $SL(2,R)$ symmetry in low-frequency limit.

Results extend to Einstein-Maxwell-Dilaton solutions.

Abstract

To perform realistic tests of theories of gravity, we need to be able to look beyond general relativity and evaluate the consistency of alternative theories with observational data from, especially, gravitational wave detections using, for example, an agnostic Bayesian approach. In this paper we further examine properties of one class of such viable, alternative theories, based on metrics arising from ungauged supergravity. In particular, we examine the massless, neutral, minimally coupled scalar wave equation in a general stationary, axisymmetric background metric such as that of a charged rotating black hole, when the scalar field is either time independent or in the low-frequency, near-zone limit, with a view to calculating the Love numbers of tidal perturbations, and of obtaining harmonic coordinates for the background metric. For a four-parameter family of charged asymptotically flat rotating black hole solutions of ungauged supergravity theory known as STU black holes, which includes Kaluza-Klein black holes and the Kerr-Sen black hole as special cases, we find that all time-independent solutions, and hence the harmonic coordinates of the metrics, are identical to those of the Kerr solution. In the low-frequency limit we find the scalar fields exhibit the same $SL(2,R)$ symmetry as holds in the case of the Kerr solution. We point out extensions of our results to a wider class of metrics, which includes solutions of Einstein-Maxwell-Dilaton theory.