Spontaneous Scalarization of Black Holes and Compact Stars from a Gauss-Bonnet Coupling
Hector O. SilvaDepartment of Physics and Astronomy, The University of Mississippi, University, Mississippi 38677, USAJeremy SaksteinCenter for Particle Cosmology, Department of Physics and Astronomy, University of Pennsylvania, 209 S. 33rd Street, Philadelphia, Pennsylvania 19104, USALeonardo GualtieriDipartimento di Fisica "Sapienza" Università di Roma and Sezione INFN Roma1, Piazzale Aldo Moro 5, 00185 Rome, ItalyThomas P. SotiriouSchool of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, United KingdomEmanuele BertiDepartment of Physics and Astronomy, The University of Mississippi, University, Mississippi 38677, USA
2018en
ABI
Аннотация
We identify a class of scalar-tensor theories with coupling between the scalar and the Gauss-Bonnet invariant that exhibit spontaneous scalarization for both black holes and compact stars. In particular, these theories formally admit all of the stationary solutions of general relativity, but these are not dynamically preferred if certain conditions are satisfied. Remarkably, black holes exhibit scalarization if their mass lies within one of many narrow bands. We find evidence that scalarization can occur in neutron stars as well.
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