Spontaneous scalarization in scalar–tensor theories with conformal symmetry as an attractor

Abstract Motivated by constant-G theory, we introduce a one-parameter family of scalar–tensor theories as an extension of constant-G theory in which the conformal symmetry is a cosmological attractor. Since the model has the coupling function of negative curvature, we expect spontaneous scalarizatio...

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Published inProgress of theoretical and experimental physics Vol. 2022; no. 1
Main Author Chiba, Takeshi
Format Journal Article
LanguageEnglish
Published Oxford Oxford University Press 01.01.2022
Subjects
Approximation
Gravity
Neutron stars
Neutrons
Symmetry
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ISSN2050-3911
2050-3911
DOI10.1093/ptep/ptab138

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Summary:Abstract Motivated by constant-G theory, we introduce a one-parameter family of scalar–tensor theories as an extension of constant-G theory in which the conformal symmetry is a cosmological attractor. Since the model has the coupling function of negative curvature, we expect spontaneous scalarization to occur and that the parameter can be constrained by pulsar timing measurements. Modeling neutron stars with realistic equations of state, we study the structure of neutron stars and calculate the effective scalar coupling with the neutron star in these theories. We find that within the parameter region where the observational constraints are satisfied, the effective scalar coupling almost coincides with that derived using the quadratic model with the same curvature. This indicates that the constraints obtained by the quadratic model will be used to limit the curvature of the coupling function universally in the future.
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ISSN:2050-3911
2050-3911
DOI:10.1093/ptep/ptab138