On a Modification of the Boundary State Formalism in Off-shell String Theory

TL;DR

This paper explores a modification of the boundary state formalism to accurately compute amplitudes in off-shell open string theory, extending its applicability beyond on-shell states.

Contribution

It introduces a straightforward generalization of the boundary state formalism that correctly produces matrix elements with off-shell open string states.

Findings

Generalized boundary state formalism works for off-shell open strings.

Correctly reproduces matrix elements with on-shell closed string states.

Provides a foundation for further off-shell string amplitude calculations.

Abstract

We examine the application of boundary states in computing amplitudes in off-shell open string theory. We find a straightforward generalization of boundary state which produces the correct matrix elements with on-shell closed string states.