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 diff...

The superstring theory is now regarded as the most promising candidate for the unification of the Standard Model and gravity, and this field has been rigorously investigated. However, we have seen a setback of the perturbative analysis of the superstring theory, because it has so many vacua that we have no way to determine which are the true ones. In order to remedy this problem and thus for th...

Using the U(4) formalism developed ten years ago, the worldsheet action for the super-string in Ramond-Ramond plane wave backgrounds is expressed in a manifestly N=(2,2) superconformally invariant manner. This simplifies the construction of consistent Ramond-Ramond plane wave backgrounds and eliminates the problems associated with light-cone interaction point operators. Although the constructio...

This is an introduction to, and invitation to read, a series of review articles on scattering amplitudes in gauge theory, gravity, superstring theory. Our aim provide overview the field, from basic aspects selection current (2022) research developments.

We propose a pregeometrical formulation of Berkovits’ open RamondNeveu-Schwarz(RNS) superstring field theories. We show that Berkovits’ open RNS superstring field theories arise by expanding around particular solutions of the classical equations of motion for this theory. Our action contains pure ghost operators only and so is formally background independent.

Using the pure spinor formalism for the superstring, the vertex operator for the first massive states of the open superstring is constructed in a manifestly super-Poincaré co-variant manner. This vertex operator describes a massive spin-two multiplet in terms of ten-dimensional superfields.

We give a construction for a general class of vertices in superstring field theory which include integration over bosonic moduli as well as the required picture changing insertions. We apply this procedure to find a covariant action for the NS-NS sector of Type II closed superstring field theory.

The superstring is quantized in a manner which manifestly preserves a U(5) subgroup of the (Wick-rotated) ten-dimensional super-Poincaré invariance. This description of the superstring contains critical N=2 worldsheet superconformal invariance and is a natural covariantization of the U(4)-invariant light-cone Green-Schwarz description.