QCD Phase Diagram by Holography

TL;DR

This paper constructs a holographic QCD model to study the phase diagram, revealing the relationship between chiral symmetry breaking and deconfinement transitions using black hole phase transitions.

Contribution

It introduces a novel holographic model combining Einstein-Maxwell-Scalar systems to analyze QCD phase transitions and explains the coincidence of chiral and deconfinement lines.

Findings

Black hole phase transition corresponds to quarkyonic transition.

Chiral symmetry breaking and deconfinement lines coincide.

Proposed bypass mechanism explains transition line coincidence.

Abstract

We explore QCD phase diagram by constructing a holographic QCD model using the Einstein-Maxwell-Scalar system. The chiral transition is investigated by adding a probe scalar and confinement transition is studied by adding a probe string into the system. By interpreting the black hole phase transition in the bulk spacetime as the quarkyonic transition in the dual QCD theory and introducing the bypass mechanism for deconfinement transition, we give an explanation why chiral symmetry breaking and deconfinement transition lines coincide with each other despite their different physical origins.