Open string fields as matrices

plank, tom m.;

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.