Classical limit of higher-spin string amplitudes

A bstract It has been shown that a special set of three-point amplitudes between two massive spinning states and graviton reproduces the linearised stress-energy tensor for Kerr black hole in classical limit. In this work we revisit result compare it to analysis describing interaction leading Regge open closed superstring. We find an all-spin limit interacting with photon or graviton. This differs from instead matches current four-vector generated by string coupled electromagnetism gravity respectively. For superstring amplitudes, contrary black-hole case, spin infinity is necessary reproduce multipoles.