Gross-neveu Model

We have N Dirac fermions, ψ₁, ..., ψ_N. The Lagrangian Density is

:

\mathcal{L}=\overline{\psi}_a \left(i\partial\!\!\!/-m 
ight) \psi^a + rac{g}{2N}\left \psi^a
ight^2

using the Einstein Summation Notation where g is the Coupling Constant . If the mass m is nonzero, the model is massive.

This model has an U(N) Internal Symmetry .

See also Nambu-Jona-Lasinio Model which is kind of similar, except that it has Chiral Symmetry .

	CATEGORIES ABOUT GROSS-NEVEU MODEL

	quantum field theory

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