Accumulation-point amplitudes in string theory

A bstract We point out some common qualitative features of the Coon amplitude — a family deformations Veneziano with logarithmic Regge trajectories and open string scattering for strings ending on D-brane in AdS. Both reduce to at relatively low energies. systems have an accumulation their spectrum, infinite number states below certain energy. The approach this is very similar. same high-energy fixed-angle behavior. Nevertheless, we find differences spectrum highest angular momentum. These similarities suggest that there may exist background realizes amplitude.