Hydrodynamics of the CFL superfluid

TL;DR

This paper explores the hydrodynamics of the CFL superfluid phase in dense quark matter, focusing on transport properties, phonon interactions, and implications for the rotational behavior of compact stars using analogue gravity models.

Contribution

It introduces a novel approach to derive transport properties of the CFL superfluid and applies analogue gravity models to study phonon-vortex interactions and stellar rotation effects.

Findings

Transport properties dominated by superfluid phonons.

Analogue gravity models effectively describe phonon scattering.

Implications for rotational dynamics of CFL quark matter stars.

Abstract

At asymptotic high density and low temperature quarks form Cooper pairs in a color-flavor locked (CFL) configuration. The diquark condensates break spontaneously the baryon symmetry, and this fact makes the CFL phase also superfluid. At low temperatures the transport properties are dominated by the contribution of the superfluid phonon, the Goldstone boson associated to baryon symmetry breaking, in full analogy to what happens in superfluid He4. We discuss how to derive transport properties in the ultracold regime making use of an analogue model of gravity. We also review how this model can be used to study the scattering of phonons with quantized vortices in a rotating system. Finally, we consider the implications of these results in studying the rotational properties of compact stars made of CFL quark matter