Non-topological spontaneously scalarized neutron stars in tensor-multi-scalar theories of gravity

Abstract

In the present paper, we numerically construct new non-topological, spontaneously scalarized neutron stars in the tensor-multi-scalar theories of gravity whose target space is a three-dimensional maximally symmetric space, namely either ${\mathbb{S}}^3$, ${\mathbb{H}}^3$ or ${\mathbb{R}}^3$, and in the case of a nontrivial map $\phi :\text{spacetime}\to \text{target space}$. The theories of gravity admitting scalarization are characterized by the fact that the field equations always admit the general relativistic solution but for certain ranges of the parameters space it loses stability and nonlinear development of a scalar field is observed. Thus, in order to determine the values of the parameters where such scalarization is possible we studied the stability of the general relativistic solution within the framework of the considered tensor-multi-scalar theories. Based on these results we could obtain a family of scalarized branches characterized by the number of the scalar field nodes. These branches bifurcate from the general relativistic solution at the points where new unstable modes appear and they are energetically more favorable over the pure Einstein solutions. Interestingly, in certain parameter ranges, we could obtain non-uniqueness within a single branch of scalarized solutions.

arXiv comment7 pages, 6 figures

References in corpus (13)

• The equation of state for nucleon matter and neutron star structure
• Constraints on a phenomenologically parameterized neutron-star equation of state
• Spontaneous scalarization of black holes and compact stars from a Gauss-Bonnet coupling
• New Gauss-Bonnet black holes with curvature induced scalarization in the extended scalar-tensor theories
• Radial perturbations of the scalarized EGB black holes
• Black holes with surrounding matter in scalar-tensor theories
• Phases of 4D Scalar-tensor black holes coupled to Born-Infeld nonlinear electrodynamics
• Neutron star solutions with curvature induced scalarization in the extended Gauss-Bonnet scalar-tensor theories
• Tensor-multi-scalar theories: relativistic stars and 3+1 decomposition
• Quasi-normal modes, bifurcations and non-uniqueness of charged scalar-tensor black holes
• A new type of dark compact objects in massive tensor-multi-scalar theories of gravity
• Topological neutron stars in tensor-multi-scalar theories of gravity
• Mixed configurations of tensor-multi-scalar solitons and neutron stars

Cited by in corpus (15)

• Spontaneous scalarization
• Multi-scalar Gauss-Bonnet gravity -- hairy black holes and scalarization
• Gravitational waves from accretion-induced descalarization in massive scalar-tensor theory
• Rotating tensor-multiscalar black holes with two scalars
• Stability of relativistic stars with scalar hairs
• Oscillation dynamics of scalarized neutron stars
• Tensor-Multi-Scalar Gravity: Equations of Motion to 2.5 post-Newtonian Order
• Stability of topological neutron stars
• Nonlinear evolution and non-uniqueness of scalarized neutron stars
• No-hair theorems for non-canonical self-gravitating static multiple scalar fields
• Anti-de Sitter neutron stars in the theory of gravity with nonminimal derivative coupling
• Slowly rotating topological neutron stars -- universal relations and epicyclic frequencies
• Spontaneous Scalarization in Proto-neutron Stars
• Scalarized non-topological neutron stars in multi-scalar Gauss-Bonnet gravity
• Effects of Dark Matter on the Spontaneous Scalarization in Neutron Stars