Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-09-29
Published in the Proceedings of the Conference: "Particles, Fields and Gravitation" (AIP, 1998, Woodbury, New York), P. 334-34
Physics
High Energy Physics
High Energy Physics - Theory
Talk given at the Conference "Particles, Fields and Gravitation", Lodz, Poland, April 15-19, 1998; 10 pages, 3 ps-figures, LaT
Scientific paper
10.1063/1.57134
Dynamical symmetry breaking is investigated for a four-fermion Nambu-Jona-Lasinio model in external electromagnetic and gravitational fields. An effective potential is calculated in the leading order of the large-N expansion using the proper-time Schwinger formalism. Phase transitions accompanying a chiral symmetry breaking in the Nambu-Jona-Lasinio model are studied in detail. A magnetic calalysis phenomenon is shown to exist in curved spacetime but it turns out to lose its universal character because the chiral symmetry is restored above some critical positive value of the spacetime curvature.
Elizalde Emilio
Shil'nov Yu. I.
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