# Classical solution for ghost D-branes in string field theory

## TL;DR

This paper constructs classical solutions in open string field theory representing arbitrary configurations of D-branes and ghost D-branes, demonstrating their cancellation effects through BRST cohomology analysis.

## Contribution

It introduces a method to explicitly build solutions with both D-branes and ghost D-branes, advancing understanding of their interplay in string field theory.

## Key findings

- Successfully constructs solutions with arbitrary numbers of D-branes and ghost D-branes.
- Shows cancellation of BRST cohomology between D-branes and ghost D-branes.
- Provides a classical framework for analyzing ghost D-branes in string theory.

## Abstract

A ghost D-brane has been proposed as an object that cancels the effects of a D-branes. We construct a classical solution with an arbitrary number of D-branes and ghost D-branes in the context of open string field theory. Cancellation of BRST cohomolgy between D-branes and ghost D-branes is shown.