| Four-fermi Interaction |
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Information AboutFour-fermi Interaction |
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An example is Fermi's Theory of the Weak Interaction . The interaction term has a V-A ( Vector minus Axial ) form. Another example is the Gross-Neveu Model . This is a four-fermi theory of Dirac Fermion s without Chiral Symmetry and as such, it may or may not be massive. Another example is the Thirring Model . This is a four-fermi theory of fermions with a vector coupling. Another example is the Nambu-Jona-Lasinio Model . This is a four-fermi theory of Dirac Fermion s with Chiral Symmetry and as such, it has no Bare Mass . A Nonrelativistic example is the BCS Theory at large length scales with the phonons integrated out so that the force between two Dressed Electron s is approximated by a Contact Term . |
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