Spontaneous scalarization with an extremely massive field and heavy neutron stars
arXiv:1707.02809 · doi:10.1103/PhysRevD.96.084026
Abstract
We investigate the internal structure and the mass-radius relation of neutron stars in a recently proposed scalar-tensor theory dubbed asymmetron in which a massive scalar field undergoes spontaneous scalarization inside neutron stars. We focus on the case where the Compton wavelength is shorter than 10 km, which has not been investigated in the literature. By solving the modified Einstein equations, either purely numerically or by partially using a semianalytic method, we find that not only the weakening of gravity by spontaneous scalarization but also the scalar force affect the internal structure significantly in the massive case. We also find that the maximum mass of neutron stars is larger for certain parameter sets than that in general relativity and reaches 2 solar mass even if the effect of strange hadrons is taken into account. There is even a range of parameters where the maximum mass of neutron stars largely exceeds the threshold that violates the causality bound in general relativity.
19 pages, 16 figures; published version
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Cited by in corpus (5)
- Long-lived inverse chirp signals from core collapse in massive scalar-tensor gravity
- Strong-field effects in massive scalar-tensor gravity for slowly spinning neutron stars and application to X-ray pulsar pulse profiles
- Neutron Star Structure in the Presence of Nonminimally Coupled Scalar Fields
- Spontaneous Scalarization as a New Core-Collapse Supernova Mechanism and its Multi-Messenger Signals
- Constraining self-interactions of a massive scalar field using scalar gravitational waves from stellar core collapse