Spontaneous symmetry breaking of SO(2N) in Gross-Neveu theory from 2+ε expansion
0 Abstract: It was recently established that the paradigmatic Gross--Neveu model with N copies of two-dimensional Dirac fermions features an SO( 2N ) symmetry if certain interactions are suppressed. This [...] equal to the Gaussian fixed point at Nf=1 , (ii) remains critical for all values of Nf>NSTf ,c (N )≈0.56+1. 48N+ (ϵ) , which compares well with the estimate of previous studies. We further find that (iii) …
