Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-09-11
Phys.Rev.Lett. 78 (1997) 795-798
Physics
High Energy Physics
High Energy Physics - Theory
4 pages, uses REVTeX; one introductory section, a Note, and references added. A minor mistake erased
Scientific paper
10.1103/PhysRevLett.78.795
It is shown that the physical ``quark number'' charges which appear in the central charge of the supersymmetry algebra of $N=2$ supersymmetric QCD can take irrational values and depend non trivially on the Higgs expectation value. This gives a physical interpretation of the constant shifts which the ``electric'' and ``magnetic'' variables $a_D$ and $a$ undergo when encircling a singularity, and show that duality in this model is truly an electric-magnetic-quark number duality. Also included is a computation of the monodromy matrices directly in the microscopic theory.
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