Holographic QCD phase diagram with critical point from Einstein-Maxwell-dilaton dynamics
Abstract
Supplementing the holographic Einstein-Maxwell-dilaton model of [O. DeWolfe, S.S. Gubser, C. Rosen, Phys. Rev. D83 (2011) 086005; O. DeWolfe, S.S. Gubser, C. Rosen, Phys. Rev. D84 (2011) 126014] by input of lattice QCD data for 2+1 flavors and physical quark masses for the equation of state and quark number susceptibility at zero baryo-chemical potential we explore the resulting phase diagram over the temperature-chemical potential plane. A first-order phase transition sets in at a temperature of about 112 MeV and a baryo-chemical potential of 612 MeV. We estimate the accuracy of the critical point position in the order of approximately 5-8% by considering parameter variations and different low-temperature asymptotics for the second-order quark number susceptibility. The critical pressure as a function of the temperature has a positive slope, i.e. the entropy per baryon jumps up when crossing the phase border line from larger values of temperature/baryo-chemical potential, thus classifying the phase transition as a gas liquid one. The updated holographic model exhibits in- and outgoing isentropes in the vicinity of the first-order phase transition.
Cite
@article{arxiv.1702.06731,
title = {Holographic QCD phase diagram with critical point from Einstein-Maxwell-dilaton dynamics},
author = {J. Knaute and R. Yaresko and B. Kämpfer},
journal= {arXiv preprint arXiv:1702.06731},
year = {2018}
}
Comments
extended discussions on limitations of the holographic model; typos corrected and refs added; to appear in PLB