String Creation, D-branes and Effective Field Theory

TL;DR

This paper investigates string creation in D-brane systems, revealing discrepancies in the DBI action and open string calculations, and proposes a resolution involving superghosts in the effective field theory.

Contribution

It demonstrates how superghosts reconcile differences between open string calculations and effective field theory in D-brane interactions.

Findings

DBI action fails to capture RR exchange in D-brane systems

Discrepancies persist upon lifting to M-theory

Superghosts resolve mismatches in effective field theory calculations

Abstract

This paper addresses several unsettled issues associated with string creation in systems of orthogonal Dp-D(8-p) branes. The interaction between the branes can be understood either from the closed string or open string picture. In the closed string picture it has been noted that the DBI action fails to capture an extra RR exchange between the branes. We demonstrate how this problem persists upon lifting to M-theory. These D-brane systems are analysed in the closed string picture by using gauge-fixed boundary states in a non-standard lightcone gauge, in which RR exchange can be analysed precisely. The missing piece in the DBI action also manifests itself in the open string picture as a mismatch between the Coleman-Weinberg potential obtained from the effective field theory and the corresponding open string calculation. We show that this difference can be reconciled by taking into account the superghosts in the (0+1)effective theory of the chiral fermion, that arises from gauge fixing the spontaneously broken world-line local supersymmetries.