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Yung A.V. (PNPI)
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r-Duality and "Instead - of - Confinement" Mechanism in N=1 Supersymmetric QCD
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We consider N=2 QCD with the U(N) gauge group and N_f flavors(N_f>N).
We study r-vacua with the number of condensed (s)quarks r in the interval $\frac{2}{3}N_f < r \le N$.
To pass to N=1 QCD we introduce an N=2-breaking deformation,a mass term \mu for the adjoint matter,
eventually decoupling the adjoint matter in the limit of large \mu.
If one starts from a large value of the parameter \xi\sim\mu m, where the original theory is at weak coupling,
and let \xi decrease one hits a crossover transition from weak to strong coupling (here m is a typical
value of the quark masses). Below this transition the original theory is described in terms
of a weakly coupled infrared-free r dual theory with the U(N_f-r) gauge group and
N_f light quark-like dyon
flavors. Dyon condensation leads to confinement of monopoles,
defying a naive expectation of quark confinement. The quarks and gauge bosons
of the original theory are in an``instead-of-confinement'' phase. The r and
Seiberg dualities are demonstrated to coincide
in the r=N vacua.
In the \frac{2}{3}N_f