Non-linearities in the tidal Love numbers of black holes
arXiv:2305.14444 · doi:10.1103/PhysRevD.108.024048
Abstract
Tidal Love numbers describe the linear response of a compact object under the presence of external tidal perturbations, and they are found to vanish exactly for black holes within General Relativity. In this paper we investigate the tidal deformability of neutral black holes when non-linearities in the theory are taken into account. As a case in point, we consider scalar tidal perturbations on the black hole background, and find that the tidal Love numbers may be non vanishing depending on the scalar interactions in the bulk theory. Remarkably, for non-linear sigma models, we find that the tidal Love numbers vanish to all orders in perturbation theory.
arXiv comment30 pages. v2: matching version published in PRD
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