Open String Fields as Matrices

TL;DR

This paper demonstrates that open string fields in multi-brane systems can be represented as block matrices, revealing how tachyon condensation leads to the disappearance of a D-brane within the string field framework.

Contribution

It introduces a matrix representation of string fields on multiple D-branes, connecting multi-brane dynamics with matrix theory concepts.

Findings

String fields on multi-branes are equivalent to block matrices of single-brane string fields.

Tachyon condensation causes one D-brane to vanish, as shown by the expanded action.

The approach provides a new perspective on D-brane interactions and string field theory.

Abstract

We show that the action expanded around Erler-Maccaferri's N D-brane solution describes the N+1 D-brane system where one D-brane disappears due to tachyon condensation. String fields on multi-branes can be regarded as block matrices of a string field on a single D-brane in the same way as matrix theories.