Lay Nam Chang

A new supersymmetric string model and the supergauge constraints in the dual resonance models

Abstract We present a new supersymmetric string model which can carry spin and other quantum numbers and in which the supergauge constraints arise naturally. We obtain the known dual models involving fermions as special cases.

A relativistic quantum dynamical model based on the classical string

Abstract Motivated by geometrical considerations of the string model, we construct a dynamical theory of composite particles that is Poincare invariant in four dimensions, with no tachyons and no ghosts. The resulting physical states lie on indefinitely rising trajectories.

Locally supersymmetric theories with model-independent transformation laws

Abstract We construct locally supersymmetric theories based on the inhomogeneous supergroups IOSp(N; 2C), in which supersymmetric gauge fields satisfy model-independent transformation laws. This leads to the construction of actions which are manifestly gauge and coordinate invariants.

Eikonalization with ρ meson exchange

Abstract The t -channel discontibuity of the part of the hadron hadron scattering amplitude due to exchange of an arbitrary number of ρ mesons is calculated in the resonance approximation. The answers has an eikonal form with several simple features.