Thermal conductivity due to phonons in the core of superfluid neutron stars

Understand

We compute the contribution of phonons to the thermal conductivity in the core of superfluid neutron stars.

• We use effective field theory techniques to extract the phonon scattering rates, written as a function of the equation of state of the system.
• We also calculate the phonon dispersion law beyond linear order, which depends on the gap of superfluid neutron matter.
• With all these ingredients, we solve the Boltzmann equation numerically using a variational approach.