Abstract
We show that any static linear perturbations around Schwarzschild black holes enjoy a set of conserved charges which forms a centrally extended Schrödinger algebra \( \mathfrak{sh} \)(1) = \( \mathfrak{sl} \)(2, ℝ) ⋉ \( \mathcal{H} \). The central charge is given by the black hole mass, echoing results on black hole entropy from near-horizon diffeomorphism symmetry. The finite symmetry transformations generated by these conserved charges correspond to Galilean and conformal transformations of the static field and of the coordinates. This new structure allows one to discuss the static response of a Schwarzschild black hole in the test field approximation from a symmetry-based approach. First we show that the (horizontal) symmetry protecting the vanishing of the Love numbers recently exhibited by Hui et al., dubbed the HJPSS symmetry, coincides with one of the \( \mathfrak{sl} \)(2, ℝ) generators of the Schrödinger group. Then, it is demonstrated that the HJPSS symmetry is selected thanks to the spontaneous breaking of the full Schrödinger symmetry at the horizon down to a simple abelian sub-group. The latter can be understood as the symmetry protecting the regularity of the test field at the horizon. In the 4-dimensional case, this provides a symmetry protection for the vanishing of the Schwarzschild Love numbers. Our results trivially extend to the Kerr case.
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Achour, J.B., Livine, E.R., Mukohyama, S. et al. Hidden symmetry of the static response of black holes: applications to Love numbers. J. High Energ. Phys. 2022, 112 (2022). https://doi.org/10.1007/JHEP07(2022)112
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DOI: https://doi.org/10.1007/JHEP07(2022)112