2016/09/09 by R. N. Mishra, H. S. Sahoo, P. K. Panda +2 · 2 citations
Physics and Astronomy · #nucl-th
paper · pdf · doi:10.1103/physrevc.94.035805
10 pages, Accepted in Phys. Rev. C
arxiv created 2016/09/09 · arxiv updated 2016/10/12
We determine the equation of state (EOS) of nuclear matter with the inclusion of hyperons in a self-consistent manner by using a Modified Quark Meson Coupling Model (MQMC) where the confining interaction for quarks inside a baryon is represented by a phenomenological average potential in an equally mixed scalar-vector harmonic form. The hadron-hadron interaction in nuclear matter is then realized by introducing additional quark couplings to σ, ω, and ρ mesons through mean-field approximations. The effect of a nonlinear ω-ρ term on the equation of state is studied. The hyperon couplings are fixed from the optical potential values and the mass-radius curve is determined satisfying the maximum mass constraint of 2~M\odot for neutron stars, as determined in recent measurements of the pulsar PSR J0348+0432. We also observe that there is no significant advantage of introducing the nonlinear ω-ρ term in the context of obtaining the star mass constraint in the present set of parametrizations.