Parent formulations, frame-like Lagrangians, and generalized auxiliary fields

TL;DR

This paper advances the understanding of the parent formulation of Lagrangians, clarifies the role of auxiliary fields, and derives a frame-like Lagrangian for symmetric higher spin fields in AdS space.

Contribution

It identifies natural field configurations for the parent formulation, relates it to unfolded dynamics, and systematically derives frame-like Lagrangians for higher spin fields.

Findings

Established the equivalence of parent and original Lagrangians with specific field configurations.

Connected the parent Lagrangian to the Lagrange structure of unfolded dynamics.

Derived a frame-like Lagrangian for symmetric higher spin fields in AdS space.

Abstract

We elaborate on the recently proposed Lagrangian parent formulation. In particular, we identify a natural choice of the allowed field configurations ensuring the equivalence of the parent and the starting point Lagrangians. We also analyze the structure of the generalized auxiliary fields employed in the parent formulation and establish the relationship between the parent Lagrangian and the recently proposed Lagrange structure for the unfolded dynamics. As an illustration of the parent formalism a systematic derivation of the frame-like Lagrangian for totally symmetric fields starting from the Fronsdal one is given. We also present a concise and manifestly sp(2)-symmetric form of the off-shell constraints and gauge symmetries for AdS higher spin fields at the nonlinear level.