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- W4221153670 abstract "We study linear perturbations about static and spherically symmetric black holes with a time-independent background scalar field in shift-symmetric Horndeski theories, whose Lagrangian is characterized by coupling functions depending only on the kinetic term of the scalar field $X$. We clarify conditions for the absence of ghosts and Laplacian instabilities along the radial and angular directions in both odd- and even-parity perturbations. For reflection-symmetric theories described by a k-essence Lagrangian and a nonminimal derivative coupling with the Ricci scalar, we show that black holes endowed with nontrivial scalar hair are unstable around the horizon in general. This includes nonasymptotically flat black holes known to exist when the nonminimal derivative coupling to the Ricci scalar is a linear function of $X$. We also investigate several black hole solutions in nonreflection-symmetric theories. For cubic Galileons with the Einstein-Hilbert term, there exists a nonasymptotically flat hairy black hole with no ghosts/Laplacian instabilities. Also, for the scalar field linearly coupled to the Gauss-Bonnet term, asymptotically flat black hole solutions constructed perturbatively with respect to a small coupling are free of ghosts/Laplacian instabilities." @default.
- W4221153670 created "2022-04-03" @default.
- W4221153670 creator A5013481498 @default.
- W4221153670 creator A5022472380 @default.
- W4221153670 creator A5032475694 @default.
- W4221153670 date "2022-05-02" @default.
- W4221153670 modified "2023-10-18" @default.
- W4221153670 title "Linear stability of black holes in shift-symmetric Horndeski theories with a time-independent scalar field" @default.
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- W4221153670 doi "https://doi.org/10.1103/physrevd.105.104001" @default.