Higher orders in N?1 in the Gross-Neveu model |
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Authors: | Jonathan F Schonfeld |
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Institution: | Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08540, USA |
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Abstract: | We study higher-order terms in the N expansion of the two-dimensional model field theory of Gross and Neveu. The quantity (MF is the fermion mass, Mσ is the scalar bound-state mass), is conjectured to deviate from zero in O(N?4). Order N?1 corrections are found to leave unchanged both the symmetry-breaking, and the absence of zeros of the Callan-Symanzik function β for real non-zero coupling constant. Behavior of β for complex coupling constant is altered considerably by the corrections; consequences are discussed.We obtain the following additional results: proof that the model is renormalizable without the necessity of additional interactions; construction of a perturbation theory in the asymmetric vacuum; proof of a lemma on fermion-antifermion thresholds in two-dimensional space-time; derivation of closed formulae for arbitrary one-loop integrals in two-dimensional space-time. |
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