Neutron star scalarization with Gauss-Bonnet and Ricci scalar couplings
arXiv:2111.03644 · doi:10.1103/PhysRevD.104.124078
Abstract
Spontaneous scalarization of neutron stars has been extensively studied in the Damour and Esposito-Farèse model, in which a scalar field couples to the Ricci scalar or, equivalently, to the trace of the energy-momentum tensor. However, scalarization of both black holes and neutron stars may also be triggered by a coupling of the scalar field to the Gauss-Bonnet invariant. The case of the Gauss-Bonnet coupling has also received a lot of attention lately, but the synergy of the Ricci and Gauss-Bonnet couplings has been overlooked for neutron stars. Here, we show that combining both couplings has interesting effects on the properties of scalarized neutron stars, such as affecting their domain of existence or the amount of scalar charge they carry.
14 pages, 9 figures
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- Astrophysical constraints on compact objects in 4D Einstein-Gauss-Bonnet gravity
- Constraining spontaneous black hole scalarization in scalar-tensor-Gauss-Bonnet theories with current gravitational-wave data
- Constraining modified gravity theories with scalar fields using black-hole images
- Shadows and Properties of Spin-Induced Scalarized Black Holes with and without a Ricci Coupling
- Multi-scalar Gauss-Bonnet gravity: scalarized black holes beyond spontaneous scalarization
- Axial perturbations of hairy black holes in generalised scalar-tensor theories
- Quasinormal modes of hairy black holes in shift-symmetric theories
- Purely metric Horndeski theories and spontaneous curvaturization of black holes
- Compact stars in Einstein-scalar-Gauss-Bonnet gravity: regular and divergent scalar field configurations
- Stable spontaneously-scalarized black holes in generalized scalar-tensor theories
- Neutron Stars in Scalar Torsion Theories with Nonminimal Coupling
- Scalarized Hybrid Neutron Stars in Scalar Tensor Gravity