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Stable spontaneously-scalarized black holes in generalized scalar-tensor theories

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arxiv 2204.01684 v1 pith:WOZGTHDM submitted 2022-04-04 gr-qc astro-ph.HEhep-th

Stable spontaneously-scalarized black holes in generalized scalar-tensor theories

Georgios Antoniou , Caio F. B. Macedo , Ryan McManus , Thomas P. Sotiriou This is my paper
classification gr-qc astro-ph.HEhep-th
keywords radialricciscalarblackcouplingholeshyperbolicityperturbations
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It has been shown that the synergy of a scalar field coupling with both the Ricci scalar and the Gauss-Bonnet invariant significantly affects the properties of scalarized black holes and neutron stars, including their domain of existence and the amount of scalar hair they carry. Here we study the radial stability of scalarized black-hole solutions. We demonstrate that they are stable against radial perturbations for Ricci couplings consistent with both a late-time cosmological attractor and the evasion of binary pulsar constraints. In addition, we investigate the effect of the Ricci coupling on the hyperbolicity of the equation governing linear, radial perturbations and show that it significantly reduces the region over which hyperbolicity is lost.

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Cited by 2 Pith papers

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  1. Scalarizations of magnetized Reissner-Nordstr\"om black holes induced by parity-violating and parity-preserving interactions

    gr-qc 2026-04 unverdicted novelty 5.0

    Magnetic fields lower the scalarization threshold for electromagnetic and gravitational Chern-Simons couplings but produce opposite trends on the two Gauss-Bonnet branches, with nonlinear terms converting exponential ...

  2. Minimum mass, maximum charge and hyperbolicity in scalar Gauss-Bonnet gravity

    gr-qc 2026-04 unverdicted novelty 5.0

    In scalar Gauss-Bonnet gravity, black hole solutions below a tunable minimum mass lose hyperbolicity in perturbations, corresponding to EFT breakdown, but scalar charge stays bounded above.