Dynamical symmetry restoration for a higher-derivative four-fermion model in an external electromagnetic field
AUTOR(ES)
Elizalde, E., Gavrilov, S. P., Odintsov, S. D., Shil'nov, Yu. I.
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2000
RESUMO
A four-fermion model with additional higher-derivative terms is investigated in an external electromagnetic field. The effective potential in the leading order of large-N expansion is calculated in external constant magnetic and electric fields. It is shown that, in contrast to the former results concerning the universal character of "magnetic catalysis" in dynamical symmetry breaking, in the present higher-derivative model the magnetic field restores chiral symmetry broken initially on the tree level. Numerical results describing a second-order phase transition that accompanies the symmetry restoration at the quantum level are presented.
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