A Construction of Commutative D-branes from Lower Dimensional Non-BPS D-branes

TL;DR

This paper constructs BPS Dp-branes as exact solitons from lower-dimensional non-BPS D-branes within string field theory, resulting in a commutative gauge theory description and confirming correct charges and tension.

Contribution

It provides a novel exact soliton construction of BPS Dp-branes from non-BPS D-branes in string field theory, clarifying their gauge theory description.

Findings

Constructed an exact BPS Dp-brane soliton from non-BPS D(p-1)-branes.

Demonstrated the resulting world-volume theory is a usual gauge theory on commutative space.

Confirmed the Dp-brane has correct RR charges and tension.

Abstract

We construct an exact soliton, which represents a BPS Dp-brane, in a boundary string field theory action of infinitely many non-BPS D(p-1)-branes. Furthermore, we show that this soliton can be regarded as an exact soliton in the full string field theory. The world-volume theory of the BPS Dp-brane constructed in this way becomes usual gauge theory on commutative R^{p+1}, instead of non-commutative plane. We also construct a D$p$-brane from non-BPS D(p-n)-branes by the ABS like configuration. We confirm that the Dp-brane has correct RR charges and the tension.