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In Hoyos et al. (arXiv:1603.02943) a holographic D3/D7 system was used todescribe 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 tosupport exotic dense stars. That analysis used a hard quark mass to representthe dynamical mass and assumed a conformal gauge background. Here wephenomenologically adjust the D3/D7 system to include a running anomalousdimension for the quark condensate. This introduces a dynamical mechanism forchiral symmetry breaking yet the model still has a deconfined massive phase atintermediate densities. We show that these systems, dependent on the runningprofile in the deep IR, generate much stiffer equations of state andnon-monotonic behaviour in the speed of sound. The results suggest that theseequations of state may be closer to supporting hybrid stars with quark cores.

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