Three dimensional four-fermion models - A Monte Carlo study

Abstract

We present results from numerical simulations of three different 3d four-fermion models that exhibit Z_2, U(1), and SU(2) x SU(2) chiral symmetries, respectively. We performed the simulations by using the hybrid Monte Carlo algorithm. We employed finite size scaling methods on lattices ranging from 8^3 to 40^3 to study the properties of the second order chiral phase transition in each model. The corresponding critical coupling defines an ultraviolet fixed point of the renormalization group. In our high precision simulations, we detected next-to-leading order corrections for various critical exponents and we found them to be in good agreement with existing analytical large-N_f calculations.

15 pages, 7 figures, and 2 tables

References in corpus (2)

• Interactions and phase transitions on graphene's honeycomb lattice
• Monte Carlo simulations of the NJL model near the nonzero temperature phase transition

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• Chiral critical behavior of 3D lattice fermionic models with quartic interactions
• Fermion bag solutions to some sign problems in four-fermion field theories
• Conjecture on the lower bound of the length-scale critical exponent $\nu$ at continuous phase transitions