NJL and QCD from string theory
Apr, 2006
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Abstract:
We study a configuration of D-branes in string theory that is described at low energies by a four-dimensional field theory with a dynamically broken chiral symmetry. In a certain region of the parameter space of the brane configuration the low-energy theory is a non-local generalization of the Nambu-Jona-Lasinio (NJL) model. This vector model is exactly solvable at large N_c and dynamically breaks chiral symmetry at arbitrarily weak 't Hooft coupling. At strong coupling the dynamics is determined by the low-energy theory on D-branes living in the near-horizon geometry of other branes. In a different region of parameter space the brane construction gives rise to large N_c QCD. Thus the D-brane system interpolates between NJL and QCD.- string model
- membrane model: D-brane
- Jona-Lasinio-Nambu model
- gauge field theory: SU(N)
- fermion: flavor
- symmetry breaking: chiral
- dynamical symmetry breaking
- approximation: weak coupling
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