Quark meanfield model for nuclear matter with or without bag
Abstract
We propose the quark meanfield bag (QMFB) model by incorporating the bag confinement mechanism in the original quark meanfield model. Nuclear matter and neutron star properties are studied with the QMFB model. For the study of the bag effect, we fit 12 parameter sets by reproducing the empirical saturation properties of nuclear matter. Quark confinement is found to be mainly demonstrated by the bag after it is included in the model, instead of the confining potential. For nuclear matter, the bag decreases the binding energy and increases the symmetry energy. For neutron stars, the bag affects significantly the radius R of a 1.4 M_{☉} star, with the maximum mass only slightly modified. The bag also has a large suppression effect on the wellaccepted R versus L dependence, with L the symmetry energy slope at the saturation density.
 Publication:

Physical Review C
 Pub Date:
 February 2019
 DOI:
 10.1103/PhysRevC.99.025804
 arXiv:
 arXiv:1805.04678
 Bibcode:
 2019PhRvC..99b5804Z
 Keywords:

 Nuclear Theory;
 Astrophysics  High Energy Astrophysical Phenomena;
 High Energy Physics  Theory
 EPrint:
 8 pages, 5 figures, 2 tables, Phys. Rev. C accepted