Virasoro amplitude from the $S^N\R^{24}$ orbifold sigma model

TL;DR

This paper derives the four tachyon scattering amplitude from the $S^N ext{R}^{24}$ orbifold sigma model, providing a bosonic analog of a supersymmetric vertex for closed string interactions in the large N limit.

Contribution

It introduces a bosonic analog of the supersymmetric vertex for closed string interactions derived from the orbifold sigma model.

Findings

Derived the four tachyon scattering amplitude.

Proposed a bosonic analog of the supersymmetric vertex.

Analyzed the large N limit of the model.

Abstract

Four tachyon scattering amplitude is derived from the $S^N\R^{24}$ orbifold sigma model in the large $N$ limit. The closed string interaction is described by a vertex which is a bosonic analog of the supersymmetric one, recently proposed by Dijkgraaf, Verlinde and Verlinde.