ar X iv : h ep - l at / 9 50 10 37 v 1 3 1 Ja n 19 95 The U ( 1 ) Gross - Neveu Model at Non - Zero Chemical Potential
نویسندگان
چکیده
The four-fermi model with continuous chiral symmetry is studied in three di-mensions at non-zero chemical potential μ using both the 1/Nf expansion andcomputer simulations. For strong coupling this model spontaneously breaksits U(1) chiral symmetry at zero chemical potential and the Goldstone mech-anism is realized through massless pions. The computer simulation predicts acritical chemical potential μc close to the lightest fermion mass in the model.As μ is increased beyond μc, the pion screening mass increases rapidly fromzero to a nonvanishing value indicating symmetry restoration. Some lessonsare drawn relevant to lattice QCD simulations at non-zero μ.11.10.Kk, 11.15.Ha, 11.15.Pg, 11.10.Wx Typeset using REVTEX1
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