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Mean field theory of effective spin models as a baryon fugacity expansion
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The free energy of effective spin or "Polyakov line" models with a chemical potential, based on the U(N) group, does not depend on the chemical potential. In a mean field-inspired expansion, we show how the condition of unit determinant, taking U(N) to SU(N), reintroduces the chemical potential, and allows us to express the free energy, as a function of mean field variational parameters, in terms of an expansion in the baryon (rather than the quark) fugacity at each lattice site. We solve the SU(3) mean field equations numerically to determine the phase diagram and compute observables. We also calculate the first corrections to the leading order mean field results, and find that these can significantly shift the endpoint of a line of first order transitions. The problem of deriving an effective spin model from full QCD is discussed.
Forward citations
Cited by 2 Pith papers
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From deconfinement to nuclear matter: mean-field approaches for effective Polyakov loop theories of lattice QCD
A resummed mean-field approximation reproduces effective Polyakov loop theory Monte Carlo results at percent level, enabling analytic determination of heavy-quark QCD phase diagrams.
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Finite density lattice QCD via effective Polyakov loop theories
A resummed mean-field approximation for effective Polyakov loop theories reproduces the pure-gauge deconfinement critical coupling to about 3% and is used to sketch finite-density phase boundaries, with low-temperatur...
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