D-brane States and Disk Amplitudes in OSp Invariant Closed String Field Theory

TL;DR

This paper constructs solitonic states in OSp invariant string field theory that are BRST invariant and uses them to compute disk amplitudes, demonstrating their interpretation as D-branes and ghost D-branes.

Contribution

It introduces a method to construct BRST invariant solitonic states in OSp invariant string field theory and computes disk amplitudes for these states.

Findings

Solitonic states are BRST invariant in the leading order.

Disk amplitudes computed from these states match D-brane and ghost D-brane descriptions.

The approach provides a new way to analyze D-branes in string field theory.

Abstract

We construct solitonic states in the OSp invariant string field theory, which are BRST invariant in the leading order of regularization parameter $\epsilon$. We calculate the disk amplitudes using these solitonic states and show that they describe D-branes and ghost D-branes.