Sewing string tree vertices with ghosts

TL;DR

This paper demonstrates a method to sew string vertices with ghosts at tree level using group theory, verifying BRST invariance and correct ghost number to produce new tree vertices in string theory.

Contribution

It introduces a group theoretic approach to sewing string vertices with ghosts, ensuring BRST invariance and proper ghost number in the resulting vertices.

Findings

Successfully sewed string vertices with ghosts at tree level.

Verified BRST invariance of the new vertices.

Confirmed correct ghost number in the sewn vertices.

Abstract

It is shown how to sew string vertices with ghosts at tree level in order to produce new tree vertices using the Group Theoretic approach to String Theory. It is then verified the BRST invariance of the sewn vertex and shown that it has the correct ghost number.