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Phases of unitary matrix models and lattice QCD2 Russo, J. G. (Jorge Guillermo) Matèria condensada Teoria de camps (Física) Condensed matter Field theory (Physics) We investigate the different large N phases of a generalized Gross-Witten-Wadia (GWW) U(N) matrix model. The deformation mimics the one-loop determinant of fermion matter with a particular coupling to gauge fields. In one version of the model, the GWW phase transition is smoothed out and it becomes a crossover. In another version, the phase transition occurs along a critical line in the two-dimensional parameter space spanned by the 't Hooft coupling λ and the Veneziano parameter τ. We compute the expectation value of Wilson loops in both phases, showing that the transition is third order. A calculation of the β function shows the existence of an IR stable fixed point. 2021-03-12T10:21:58Z 2021-03-12T10:21:58Z 2020-11-23 2021-03-12T10:21:58Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.102.105019 Physical Review D, 2020, vol. 102, num. 10, p. 105019 https://doi.org/10.1103/PhysRevD.102.105019 cc-by (c) Russo, J.G., 2020 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)