Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.131103
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Funding
- European Social Fund, the Ministry of Science, Research and the Arts Baden Wurttemberg
- Baden-Wurttemberg Stiftung
- Bulgarian NSF [DFNI T02/6]
- Sofia University Research Fund [80.1030/2017, 3258/2017]
- COST Actions [MP1304, CA15117, CA16104]
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In the present Letter, we consider a class of extended scalar-tensor-Gauss-Bonnet (ESTGB) theories for which the scalar degree of freedom is excited only in the extreme curvature regime. We show that in the mentioned class of ESTGB theories there exist new black-hole solutions that are formed by spontaneous scalarization of the Schwarzschild black holes in the extreme curvature regime. In this regime, below certain mass, the Schwarzschild solution becomes unstable and a new branch of solutions with a nontrivial scalar field bifurcates from the Schwarzschild one. As a matter of fact, more than one branch with a nontrivial scalar field can bifurcate at different masses, but only the first one is supposed to be stable. This effect is quite similar to the spontaneous scalarization of neutron stars. In contrast to the standard spontaneous scalarization of neutron stars, which is induced by the presence of matter, in our case, the scalarization is induced by the curvature of the spacetime.
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