Superspace Action for the First Massive States of the Superstring

TL;DR

This paper constructs a supersymmetric action for the first massive states of the open superstring in four dimensions, describing their multiplet structure and interactions within a manifestly supersymmetric framework.

Contribution

It introduces a novel superspace action for massive superstring states, extending the understanding of superstring field theory to include massive multiplets in four dimensions.

Findings

Successfully formulated a supersymmetric action for massive states

Described a massive spin-2 multiplet coupled to scalar multiplets

Provided a framework for analyzing massive superstring states in 4D

Abstract

Using the manifestly spacetime-supersymmetric version of open superstring field theory, we construct the free action for the first massive states of the open superstring compactified to four dimensions. This action is in N=1 D=4 superspace and describes a massive spin-2 multiplet coupled to two massive scalar multiplets.