Nuclear Physics Seminar with Marco Hofmann on Removing Cutoff-Regularization Artefacts in the Phase Diagram of Color-Superconducting Quark Matter

The cores of neutron stars and the remnants of neutron star mergers might be dense enough to contain deconfined quark matter. At temperatures up to the order of 100 MeV and densities of a few times nuclear saturation density, quark matter is expected to be in a color-superconducting state. In this state, quarks form Cooper pairs analogously to electrons in a solid-state superconductor. Which colors and flavors are paired with each other depends on the temperature and the chemical potential.

In this talk, I explain how to calculate the phase diagram of neutral three-flavour quark matter with a NJL-type model. Special focus is put on how cutoff-regularization artefacts can be systematically removed using a modification of the renormalization group-consistent scheme presented by Braun et al (2018). I show that removing cutoff-artefacts changes the phase diagram significantly already at intermediate densities in a way consistent with Ginzburg-Landau theory.