BPS kinks in the Gross-Neveu model

Details BPS kinks in the Gross-Neveu model BPS kinks in the Gross-Neveu model

2001-05-15

arxiv.org/abs/hep-th/0105148v1

Phys.Rev. D65 (2002) 025001

Physics

High Energy Physics

High Energy Physics - Theory

22 pages, 5 figures

Scientific paper

10.1103/PhysRevD.65.025001

We find the exact spectrum and degeneracies for the Gross-Neveu model in two dimensions. This model describes N interacting Majorana fermions; it is asymptotically free, and has dynamical mass generation and spontaneous chiral symmetry breaking. We show here that the spectrum contains 2^{N/2} kinks for any $N$. The unusual \sqrt{2} in the number of kinks for odd $N$ comes from restrictions on the allowed multi-kink states. These kinks are the BPS states for a generalized supersymmetry where the conserved current is of dimension N/2; the N=3 case is the {\cal N}=1 supersymmetric sine-Gordon model, for which the spectrum consists of 2\sqrt{2} kinks. We find the exact S matrix for these kinks, and the exact free energy for the model.

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