A new first order formalism for k-supersymmetric Born Infeld actions: the D3-brane example

TL;DR

This paper presents a novel first order formalism for k-supersymmetric p-brane actions, simplifying the structure and making it applicable to complex supergravity backgrounds, exemplified by the D3-brane case.

Contribution

It introduces a compact, elegant first order formulation for k-supersymmetric actions that incorporates auxiliary fields and local symmetries, applicable to various supergravity backgrounds.

Findings

The formalism is invariant under a projector-derived k-supersymmetry variation.

All fermionic fields are incorporated into curvature definitions, simplifying the action.

Enables analysis of boundary actions for complex supergravity solutions like D3-branes on ALE manifolds.

Abstract

We introduce a new first order formulation of world-volume actions for p-branes with k-supersymmetry. In this language, which involves more auxiliary fields compensated by more local symmetries, the action is provided by a very compact, simple and elegant formula applicable to any supergravity background. The k-supersymmetry variation against which it is invariant is obtained from the bulk supersymmetries by means of a projector that has a simple expression in terms of the auxiliary fields. The distinctive feature of our formalism is that all fermion fields are hidden into the definition of the curvatures and the action is formally the same, in terms of these differential forms as it would be in a purely bosonic theory. Typically our new formulation enables one to discuss the correct boundary actions for non trivial supergravity Dp-brane bulk solutions like the D3-brane solution on smooth ALE manifolds with flux recently constructed in the literature