Multi-Regge limit of the Shapiro-Virasoro model; A sister for the pomeron

The structure of the four-, five-and six-point functions in the Shapiro-Virasoro model in multi-Regge and double-helicity pole limits is studied in detail. A pomeron propagator is derived along with the pomeron-particle-pomeron vertex function. The structure of both is investigated and evidence provided for the existence of a pomeron sister trajectory, related to the usual trajectory, αp, by $\text{β}\text{p}\text{=}\text{1}\text{2}\text{α}\text{p}\text{? 1}$; this is demonstrated to exist and its contribution to the full amplitude derived. Throughout, a correspondence between regions of angular integration in the Shapiro-Virasoro model and twisted configurations in the conventional dual model is emphasised.