Extension of Boundary String Field Theory on Disc and RP2 Worldsheet Geometries

TL;DR

This paper extends boundary string field theory to include disc and RP2 worldsheet geometries, introducing a new BRS operator for RP2 and exploring off-shell states, thereby unifying D-branes and orientifold planes.

Contribution

It generalizes boundary string field theory to RP2 geometries and constructs an interpolation between D-branes and orientifold planes.

Findings

Constructed a BRS operator for RP2 geometry.

Extended boundary string field theory to include RP2.

Provided a framework for interpolating D-branes and orientifold planes.

Abstract

We present a construction of open-closed string field theory based on disc and RP2 geometries. Finding an appropriate BRS operator in the case of the RP2 geometry, we generalize the background independent open string field theory (or boundary string field theory) of Witten on a unit disc. The coupling constant flow at the closed string side is driven by the scalar operator inserted at the nontrivial loop of RP2. We discuss the off-shell extension of the boundary/crosscap states. Our construction provides an interpolation of orientifold planes of various dimensions as well as that of D-branes.