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Abstract: The method of optimized perturbation theory (OPT) is used to study the phasediagram of the massless Gross-Neveu model in 2+1 dimensions. In the temperatureand chemical potential plane, our results give strong support to the existenceof a tricritical point and line of first order phase transition, previouslyonly suspected to exist from extensive lattice Monte Carlo simulations. Inaddition of presenting these results we discuss how the OPT can be implementedin conjunction with the Landau expansion in order to determine all the relevantcritical quantities.



Autor: Jean-Loic Kneur, Marcus Benghi Pinto, Rudnei O. Ramos, Ederson Staudt

Fuente: https://arxiv.org/







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