Effects of the nucleon radius on neutron stars in a quark mean field model

Zhen-Yu Zhu and Ang Li
Phys. Rev. C 97, 035805 – Published 27 March 2018

Abstract

We study the effects of free space nucleon radius on nuclear matter and neutron stars within the framework of the quark mean field model. The nucleon radius is treated self-consistently with this model, where quark confinement is adjusted to fit different values of nucleon radius. Corrections due to center-of-mass motion, quark-pion coupling, and one gluon exchange are included to obtain the nucleon mass in vacuum. The meson coupling constants that describe the behavior of the many-body nucleonic system are constructed by reproducing the empirical saturation properties of nuclear matter, including the recent determinations of symmetry energy parameters. Our results show that the nucleon radius in free space has negligible effects on the nuclear matter equation of state and neutron star mass-radius relations, which is different from the conclusion drawn in previous studies. We further explore that the sensitivity of star radius on the nucleon radius found in earlier publications is actually from the symmetry energy and its slope.

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  • Received 16 October 2017

DOI:https://doi.org/10.1103/PhysRevC.97.035805

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsGravitation, Cosmology & Astrophysics

Authors & Affiliations

Zhen-Yu Zhu and Ang Li*

  • Department of Astronomy, Xiamen University, Xiamen 361005, China

  • *liang@xmu.edu.cn

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Vol. 97, Iss. 3 — March 2018

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