Reformulation of Boundary String Field Theory in terms of Boundary State

TL;DR

This paper presents a new formulation of bosonic boundary string field theory using boundary states, enabling formal integration of equations of motion for arbitrary configurations and potentially illuminating interactions with the closed string sector.

Contribution

The paper introduces a boundary state-based formulation of boundary string field theory that does not assume matter-ghost decoupling, providing a more general framework.

Findings

General form of the boundary string field theory action derived

Formal integration of equations of motion achieved for arbitrary configurations

Potential insights into boundary and closed string interactions

Abstract

We reformulate bosonic boundary string field theory in terms of boundary state. In our formulation, we can formally perform the integration of target space equations of motion for arbitrary field configurations without assuming decoupling of matter and ghost. Thus, we obtain the general form of the action of bosonic boundary string field theory. This formulation may help us to understand possible interactions between boundary string field theory and the closed string sector.