The pasta phase within density dependent hadronic models

TL;DR

This paper explores the formation of nuclear pasta phases in dense matter using density-dependent hadronic models, comparing different parametrizations and methods, and analyzing observational constraints and finite temperature effects.

Contribution

It introduces a comparative analysis of pasta phase onset using various density-dependent models and methods, including the influence of the delta meson, at zero and finite temperatures.

Findings

Different parametrizations affect the density and pressure at pasta onset.

The delta meson influences the phase transition properties.

Results align with observational and experimental constraints.

Abstract

In the present paper we investigate the onset of the pasta phase with different parametrisations of the density dependent hadronic model and compare the results with one of the usual parametrisation of the non-linear Walecka model. The influence of the scalar-isovector virtual delta meson is shown. At zero temperature two different methods are used, one based on coexistent phases and the other on the Thomas-Fermi approximation. At finite temperature only the coexistence phases method is used. npe matter with fixed proton fractions and in beta-equilibrium are studied. We compare our results with restrictions imposed on the the values of the density and pressure at the inner edge of the crust, obtained from observations of the Vela pulsar and recent isospin diffusion data from heavy-ion reactions, and with predictions from spinodal calculations.