Phase diagram of nuclear "pasta" and its uncertainties in supernova cores

Abstract

We examine the model dependence of the phase diagram of inhomogeneous nulcear matter in supernova cores using the quantum molecular dynamics (QMD). Inhomogeneous matter includes crystallized matter with nonspherical nuclei - "pasta" phases - and the liquid-gas phase separating nuclear matter. Major differences between the phase diagrams of the QMD models can be explained by the energy of pure neutron matter at low densities and the saturation density of asymmetric nuclear matter. We show the density dependence of the symmetry energy is also useful to understand uncertainties of the phase diagram. We point out that, for typical nuclear models, the mass fraction of the pasta phases in the later stage of the collapsing cores is higher than 10-20 %.

11 pages, 5 figures

References in corpus (6)

• Theory of Core-Collapse Supernovae
• Nuclear pasta structures and the charge screening effect
• The symmetry energy at subnuclear densities and nuclei in neutron star crusts
• Nonuniform Neutron-Rich Matter and Coherent Neutrino Scattering
• Simulation of Transitions between "Pasta" Phases in Dense Matter
• Impact of nuclear "pasta" on neutrino transport in collapsing stellar cores

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