Low density instabilities in asymmetric nuclear matter within QMC with $\delta$-meson

Abstract

In the present work we include the isovector-scalar $\delta$-meson in the quark-meson coupling model (QMC) and study the properties of asymmetric nuclear within QMC without and with the $\delta$-meson. Recent constraints set by isospin diffusion on the slope parameter of the nuclear symmetry energy at saturation density are used to adjust the model parameters. The thermodynamical spinodal surfaces are obtained and the instability region at subsaturation densities within QMC and QMC$\delta$ models are compared with mean-field relativistic models. The distillation effect in the QMC model is discussed.

8 pages, 7 captions, 12 figures

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• $\delta$ meson effects on neutron stars in the modified quark-meson coupling model
• The outer crust of a cold, non-accreting neutron star within the Quark-Meson Coupling (QMC) model
• Preliminary EoS for core-collapse supernova simulations with the QMC model