Vortex structure in superfluid color-flavor locked quark matter

TL;DR

This paper investigates vortex structures in superfluid color-flavor locked quark matter within neutron star cores, focusing on vortex stability, decay into semi-superfluid fluxtubes, and potential lattice formations affecting star dynamics.

Contribution

It extends previous work by developing a framework to study multi-vortex dynamics and semi-superfluid string lattice structures in CFL quark matter.

Findings

Numerical evidence of vortex decay into semi-superfluid fluxtubes.

Development of a framework for multi-vortex dynamics.

Potential implications for vortex pinning in neutron star cores.

Abstract

The core region of a neutron star may feature quark matter in the color-flavor- locked (CFL) phase. The CFL condensate breaks the baryon number symmetry, such that the phenomenon of superfluidity arises. If the core of the star is rotating, vortices will form in the superfluid, carrying the quanta of angular momentum. In a previous study we have solved the question of stability of these vortices, where we found numerical proof of a conjectured instability, according to which superfluid vortices will decay into an arrangement of so-called semi-superfluid fluxtubes. Here we report first results of an extension of our framework that allows us to study multi-vortex dynamics. This will in turn enable us to investigate the structure of semi-superfluid string lattices, which could be relevant to study pinning phenomena at the boundary of the core.