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Type: Journal article
Title: Isovector effects in neutron stars, radii, and the GW170817 constraint
Author: Motta, T.F.
Kalaitzis, A.M.
Antic, S.
Guichon, P.A.M.
Stone, J.R.
Thomas, A.W.
Citation: Astrophysical Journal, 2019; 878(2):159-1-159-7
Issue Date: 2019
ISSN: 0004-637X
Statement of
. F. Motta, A. M. Kalaitzis, S. Antić, P. A. M. Guichon, J. R. Stone, and A. W. Thomas
Abstract: An isovector–scalar meson is incorporated self-consistently into the quark–meson coupling description of nuclear matter, and its most prominent effects on the structure of neutron stars are investigated. The recent measurement of GW170817 is used to constrain the strength of the isovector–scalar channel. With the imminent measurements of the neutron star radii in the NICER mission, it is particularly notable that the inclusion of the isovector–scalar force has a significant impact. Indeed, the effect of this interaction on the neutron star radii and masses is larger than the uncertainties introduced by variations in the parameters of symmetric nuclear matter at saturation, namely the density, binding energy per nucleon, and the symmetry energy. In addition, as the analysis of GW170817 has provided constraints on the binary tidal deformability of merging neutron stars, the predictions for this parameter within the quark–meson coupling model are explored, as well as the moment of inertia and the quadrupole moment of slowly rotating neutron stars.
Keywords: Equation of state; gravitational waves; stars: neutron
Rights: © 2019. The American Astronomical Society. All rights reserved.
RMID: 0030121135
DOI: 10.3847/1538-4357/ab218e
Grant ID:
Appears in Collections:Physics publications

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