paper

Phase Structure of Four-Fermion Theories at Finite Temperature and Chemical Potential in Arbitrary Dimensions

arXiv:hep-ph/9409413 · doi:10.1142/S0217751X95001091

Abstract

The phase structure of four-fermion theories is thoroughly investigated with varying temperature and chemical potential for arbitrary space-time dimensions by using the 1/N expansion method. It is shown that the chiral symmetry is restored in the theory under consideration for sufficiently high temperature and/or chemical potential. The critical line dividing the symmetric and broken phase is given explicitly. It is found that for space-time dimension both the first-order and second-order phase transition occur depending on the value of temperature and chemical potential while for only the second-order phase transition exists.

32 pages, uses LaTeX, here.sty(attached), eepic.sty, HUPD-9402 (some misprints corrected)

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