Deconfined, Massive Quark Phase at High Density and Compact Stars: A Holographic Study

TL;DR

This study modifies a holographic model of dense quark matter to produce stiffer equations of state, potentially supporting hybrid stars with quark cores, by incorporating a running anomalous dimension for the quark condensate.

Contribution

It introduces a phenomenological adjustment to the D3/D7 holographic system to include a running anomalous dimension, enabling a more realistic modeling of quark matter at high density.

Findings

Stiffer equations of state with non-monotonic speed of sound behavior.

Potential support for hybrid stars with quark cores.

Dependence of results on the IR running profile.

Abstract

In Hoyos et al. (arXiv:1603.02943) a holographic D3/D7 system was used to describe a deconfined yet massive quark phase of QCD at finite density, concluding that the equation of state of such a phase was not stiff enough to support exotic dense stars. That analysis used a hard quark mass to represent the dynamical mass and assumed a conformal gauge background. Here we phenomenologically adjust the D3/D7 system to include a running anomalous dimension for the quark condensate. This introduces a dynamical mechanism for chiral symmetry breaking yet the model still has a deconfined massive phase at intermediate densities. We show that these systems, dependent on the running profile in the deep IR, generate much stiffer equations of state and non-monotonic behaviour in the speed of sound. The results suggest that these equations of state may be closer to supporting hybrid stars with quark cores.