Crossing Symmetry and Hadron Dynamics

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Abstract
A method of carrying out bootstrap calculations is described in which analyticity properties enter indirectly. There are two main features: the use of a nonlinear Bethe-Salpeter equation which automatically maintains the symmetry properties of amplitudes, and the use of crossing symmetry in the construction of effective propagators. Two illustrative examples are considered. One is a simplified nonlinear equation for the familiar static model of baryon-meson interactions. The other is a model for interactions mediated by vector mesons.