Supergravity Black Holes, Love Numbers and Harmonic Coordinates

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, nearzone 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.

Turning rotating D-branes and BHs inside out their photon-halo

“…In this Section, we extend the previous analysis of CT transformations to eSTURBHs (extremal rotating BHs in STU supergravity) [12,13,35,39]. For simplicity we only consider charged BHs with 4 electric charges that can be obtained adding angular momentum to bound states of 4 stacks of D3-branes wrapped around (intersecting) 3-cycles in a torus T 6 or a CY 3-fold.…”

Hidden symmetry of the static response of black holes: Applications to Love numbers

“…The relativistic theory of TLNs was introduced in Refs. [3][4][5] and applied to a variety of compact objects, from neutron stars, black holes to more exotic self-gravitating systems [9][10][11][12][13][14][15]. As first shown in Refs.…”