Neutron Stars in the Symmetron Model

Screening mechanisms are often deployed by dark energy models to conceal the effects of their new degrees of freedom from the scrutiny of terrestrial and solar system experiments. However, the extreme properties of nuclear matter may lead to a partial failure of screening mechanisms inside the most...

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Bibliographic Details
Published in:Universe (Basel) 2022-01, Vol.8 (1), p.6
Main Authors: de Aguiar, Bernardo F., Mendes, Raissa F. P., Falciano, Felipe T.
Format: Article
Language:English
Subjects:
Cosmology
Dark energy
modified gravity
Neutron stars
screening mechanisms
Solar system
Stars
symmetron
Symmetry
Theory of relativity
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Summary:Screening mechanisms are often deployed by dark energy models to conceal the effects of their new degrees of freedom from the scrutiny of terrestrial and solar system experiments. However, the extreme properties of nuclear matter may lead to a partial failure of screening mechanisms inside the most massive neutron stars observed in nature, opening up the possibility of probing these theories with neutron star observations. In this work, we explore equilibrium and stability properties of neutron stars in two variants of the symmetron model. We show that around sufficiently compact neutron stars, the symmetron is amplified with respect to its background (cosmological) value by several orders of magnitude, and that the properties of such unscreened stars are sensitive to corrections to the leading linear coupling between the symmetron and matter.
ISSN:2218-1997
2218-1997
DOI:10.3390/universe8010006