University of Minnesota
School of Physics & Astronomy

Nuclear Physics Seminar

Friday, October 21st 2016
10:10 am:
Speaker: Sean Bartz, Macalester University
Subject: Chiral phase transition and meson melting in a soft-wall model of AdS/QCD

The AdS/CFT correspondence describes many features of non-perturbative QCD. A phenomenological approach called AdS/QCD uses a dilaton field to break conformal symmetry. This describes the linear confinement of hadronic spectra at zero temperature. Using an AdS-black hole metric allows for the study of the behavior of hadrons interacting with a hot, dense medium like the quark-gluon plasma.

We present an improved AdS/QCD model for meson spectra and chiral dynamics at finite temperature and baryon chemical potential. We find a second-order chiral phase transition in the chiral limit, with a critical temperature of 155 MeV, consistent with lattice calculations, and critical baryon chemical potential of 566 MeV. For physical quark mass the transition is a rapid crossover, with a pseudo-transition temperature and density of 151 MeV and 559 MeV, respectively. Using a pure AdS-Schwarzschild metric, the light meson bound states are found to melt before the chiral phase transition occurs. This behavior may be modified with appropriate parameterization of the metric.

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