Discontinuous BPS spectra in N = 2 susy QCD
Abstract
These notes are based on work done in collaboration with Frank Ferrari. We show how to determine the spectra of stable BPS states in N = 2 supersymmetric SU(2) Yang-Mills theories that are asymptotically free, i.e. without and with Nƒ = 1,2, 3 quark hypermultiplets. In all cases:
bull; There is a curve of marginal stability diffeomorphic to a circle and going through all (finite) singular points of moduli space. bull; The BPS spectra are discontinuous across these curves. bull; The strong-coupling spectra (inside the curves) contain only those BPS states that can become massless and are responsible for the singularities. Except for Nƒ = 3, they form a multiplet (with different masses) of the broken global discrete symmetry. bull; All other semi-classical BPS states must and do decay consistently when crossing the curves. bull; The weak-coupling, i.e. semi-classical BPS spectra, contain no magnetic charges larger than one for Nƒ = 0, 1, 2 and no magnetic charges larger than two for Nƒ = 3.- Publication:
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Nuclear Physics B Proceedings Supplements
- Pub Date:
- January 1997
- DOI:
- 10.1016/S0920-5632(96)00582-8
- arXiv:
- arXiv:hep-th/9606192
- Bibcode:
- 1997NuPhS..52..305B
- Keywords:
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- High Energy Physics - Theory
- E-Print:
- 10 pages, Latex, Talk given at SUSY'96, College Park, MD, June 1996