Transport properties of nuclear pasta phase with quantum molecular dynamics

Abstract

We study the transport properties of nuclear pasta for a wide range of density, temperature and proton fractions, relevant for different astrophysical scenarios adopting a quantum molecular dynamics model. In particular, we estimate the values of shear viscosity as well as electrical and thermal conductivities by calculating the static structure factor $S(q)$ using simulation data. In the density and temperature range where the pasta phase appears, the static structure factor shows irregular behavior. The presence of a slab phase greatly enhances the peak in $S(q)$. However, the effect of irregularities in $S(q)$ on the transport coefficients is not very dramatic. The values of all three transport coefficients are found to have the same orders of magnitude as found in theoretical calculations for the inner crust matter of neutron stars without the pasta phase and therefore, is in contrast to earlier speculations that a pasta layer might be highly resistive, both thermally and electrically.

version accepted in ApJ

References in corpus (9)

• The Breaking Strain of Neutron Star Crust and Gravitational Waves
• Disordered nuclear pasta, magnetic field decay, and crust cooling in neutron stars
• Simulation of Transitions between "Pasta" Phases in Dense Matter
• Formation of Nuclear "Pasta" in Supernovae
• Electron-ion scattering in dense multi-component plasmas: application to the outer crust of an accreting neutron star
• Nuclear matter in the crust of neutron stars
• Nuclear Waffles
• The Shear Viscosity and Thermal Conductivity of Nuclear Pasta
• Beyond Nuclear Pasta: Phase Transitions and Neutrino Opacity of Non-Traditional Pasta