# Superstring Field Theory with Open and Closed Strings

## TL;DR

This paper develops a Lorentz and gauge invariant superstring field theory framework for open and closed strings, including quantum effects, and explores its applications to D-branes and orientifold planes.

## Contribution

It introduces a consistent, gauge-invariant superstring field theory with quantum corrections, extending previous models to include unoriented strings and D-brane interactions.

## Key findings

- Constructed Lorentz invariant, gauge invariant 1PI effective action.
- Demonstrated satisfaction of classical and quantum BV master equations.
- Showed the role of extra free fields in coupling to D-branes and orientifolds.

## Abstract

We construct Lorentz invariant and gauge invariant 1PI effective action for closed and open superstrings and demonstrate that it satisfies the classical BV master equation. We also construct the quantum master action for this theory satisfying the quantum BV master equation and generalize the construction to unoriented theories. The extra free field needed for the construction of closed superstring field theory plays a crucial role in coupling the closed strings to D-branes and orientifold planes.

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Source: https://tomesphere.com/paper/1907.10632