Shrouded black holes in Einstein-Gauss-Bonnet gravity

0567208 - FZÚ 2023 RIV US eng J - Článek v odborném periodiku
Babichev, E. - Emond, William T. - Ramazanov, Sabir
Shrouded black holes in Einstein-Gauss-Bonnet gravity.
Physical Review D. Roč. 106, č. 6 (2022), č. článku 063524. ISSN 2470-0010. E-ISSN 2470-0029
Grant CEP: GA ČR(CZ) GJ20-16531Y
Institucionální podpora: RVO:68378271
Klíčová slova: coupling: nonminimal * field theory: scalar * black hole: static * gravitation: model
Obor OECD: Particles and field physics
Impakt faktor: 5, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevD.106.063524

We study black holes in a modified gravity scenario involving a scalar field quadratically coupled to the Gauss-Bonnet invariant. The scalar is assumed to be in a spontaneously broken phase at spatial infinity due to a bare Higgs-like potential. For a proper choice of sign, the nonminimal coupling to gravity leads to symmetry restoration near the black hole horizon, prompting the development of the scalar wall in its vicinity. The wall thickness depends on the bare mass of the scalar and can be much smaller than the Schwarzschild radius. In a weakly coupled regime, the quadratic coupling to the Gauss-Bonnet invariant effectively becomes linear, and no walls are formed. We find approximate analytical solutions for the scalar field in the test field regime, and obtain numerically static black hole solutions within this setup.
Trvalý link: https://hdl.handle.net/11104/0338490