UNIVERSAL OPEN-STRING SINGLET INTERACTION
Abstract
We argue the existence of a universal open-string interaction induced by open-string singlet exchange from the universality of gravity diagram involving open strings. At the tree level, the interaction is induced by stringy massive excitations of spin-1 and spin-2 at the leading order. The origin of this interaction is purely stringy in nature with the massless contributions canceling each other at the tree level and therefore has no field theory correspondence. The effective dimension-8 interactions at low energies for both spin-1 and spin-2 are given for the four-fermion processes. The spin-2 piece of the interaction to a pair of vector bosons is twice as strong as when it couples to a pair of fermions as a result of the SUSY constraint on the amplitudes and angular momentum decomposition. The massive spin-2 piece of the interaction is separately universal for fermions and vector bosons, in contrast to conventional massive gravity.
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