Unoriented Open-Closed String Field Theory

TL;DR

This paper develops an unoriented open-closed string field theory up to quadratic order, demonstrating gauge invariance through an infinity cancellation mechanism involving disk and projective plane amplitudes.

Contribution

It constructs a new string field theory for unoriented open-closed systems and proves gauge invariance using a novel infinity cancellation mechanism.

Findings

Gauge invariance established for the theory.

Infinity cancellation between disk and projective plane amplitudes.

Quadratic order construction of the string field theory.

Abstract

The string field theory for unoriented open-closed string mixed system is constructed up to quadratic order based on the joining-splitting type vertices. The gauge invariance with closed string transformation parameter is proved. The infinity cancellation mechanism between disk and projective plane amplitudes plays an essential role for the gauge invariance of the theory.