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Quantum HadronDynamicsIt should be possible to desribe strong interactions directly interms of hadrons: after all, they are the observable asymptoticstates.So there should be a theory “dual” to QCD, a QuantumHadronDynamics in which all the states are color invariant.It cannot be a quantum field theory: there are an infinitenumber of meson states.It could be a string theory, a field depending on an open curvewith quarks at either end: M(x)= 1 N c¯qe i x A qIn the limit N c → ∞, thistheoryshouldtendtoaclassicaltheory: the commutators [M(x),M(y)] are of order1N c.Baryons would arise as solitons of this meson theory.S. G. <strong>Rajeev</strong> Progress on the Skyrme Model
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