NJL and QCD from String Theory
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.
- Publication:
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arXiv e-prints
- Pub Date:
- April 2006
- DOI:
- 10.48550/arXiv.hep-th/0604017
- arXiv:
- arXiv:hep-th/0604017
- Bibcode:
- 2006hep.th....4017A
- Keywords:
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- High Energy Physics - Theory
- E-Print:
- 31 pages, harvmac