Duality

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Abstract
In elementary particle physics low energy interactions are characterized by resonance formation and high energy interactions by Regge pole exchanges. Duality is the hypothesis that the mechanisms are simply and quantitatively related. The background and motivation for this hypothesis, and the different degrees ov severity with which it can be formulated, together with some of its most notable predictions are described. Applications to the scattering amplitude are discussed the most significant results being exchange degeneracy for high energy scattering and the Regge interpolation of resonances at low energy. Applications to particle classification is described. Duality constraints tie together several SU(3) multiplets; the exoticity prediction for the baryon-antibaryon channel is discussed in detail. Veneziano model, a simple form of amplitude that satisfied duality explicitly and extensions to multiparticle scattering are also mentioned. Finally applications of duality to the inclusive reaction are discussed.