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Spontaneous scalarization with massive fields

Author(s): Ramazanoglu, Fethi M; Pretorius, Frans

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Abstract: We study the effect of a mass term in the spontaneous scalarization of neutron stars, for a wide range of scalar field parameters and neutron star equations of state. Even though massless scalars have been the focus of interest in spontaneous scalarization so far, recent observations of binary systems rule out most of their interesting parameter space. We point out that adding a mass term to the scalar field potential is a natural extension to the model that avoids these observational bounds if the Compton wavelength of the scalar is small compared to the binary separation. Our model is formally similar to the asymmetron scenario recently introduced in application to cosmology, though here we are interested in consequences for neutron stars and thus consider a mass term that does not modify the geometry on cosmological scales. We review the allowed values for the mass and scalarization parameters in the theory given current binary system observations and black hole spin measurements. We show that within the allowed ranges, spontaneous scalarization can have nonperturbative, strong effects that may lead to observable signatures in binary neutron star or black hole-neutron star mergers, or even in isolated neutron stars.
Publication Date: 15-Mar-2016
Electronic Publication Date: 3-Mar-2016
Citation: Ramazanoglu, Fethi M, Pretorius, Frans. (2016). Spontaneous scalarization with massive fields. PHYSICAL REVIEW D, 93 (10.1103/PhysRevD.93.064005
DOI: doi:10.1103/PhysRevD.93.064005
ISSN: 2470-0010
EISSN: 2470-0029
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW D
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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