The effect of isoscalar-isovector coupling in infinite nuclear matter

TL;DR

This paper investigates how nonlinear isoscalar-isovector coupling influences the density dependence of nuclear symmetry energy in infinite nuclear matter using Relativistic Mean Field theory, revealing density-dependent variations and correlations.

Contribution

It systematically analyzes the impact of nonlinear isoscalar-isovector coupling on symmetry energy and extends findings to the octet system within the RMF framework.

Findings

Stiff symmetry energy at sub-saturation densities

Soft symmetry energy at normal densities

Strong correlation between symmetric energy and coupling parameter

Abstract

Working on the framework of Relativistic Mean Field theory, we exposed the effect of nonlinear isoscalar-isovector coupling on G2 parameter set on the density dependence of nuclear symmetry energy in infinite nuclear matter. The observables like symmetric energy and few related coefficients are studied systematically. We presented the results of stiff symmetry energy at sub-saturation densities and a soft variation at normal densities. Correlation between the symmetric energy and the isoscalar-isovector coupling parameter fully demonstrated for wide range of density. The work further extended to the octet system and showed the effect of coupling over the equation of state.