Gravitational and higher-derivative interactions of massive spin 5/2 field in (A)dS space

TL;DR

This paper develops gauge-invariant interaction vertices for a massive spin 5/2 field in (A)dS space, revealing higher-derivative contributions and exploring various mass limits and their implications.

Contribution

It introduces new cubic interaction vertices for massive spin 5/2 fields with gravity and massless spin 2 fields, including higher-derivative terms, in (A)dS space.

Findings

Gravitational vertex includes minimal and higher-derivative contributions.

Constructed cubic vertices with two and three derivatives.

Analyzed limits of massless, partial massless, and flat space cases.

Abstract

Using on-shell gauge invariant formulation of relativistic dynamics we study interaction vertices for a massive spin 5/2 Dirac field propagating in (A)dS space of dimension greater than or equal to four. Gravitational interaction vertex for the massive spin 5/2 field and all cubic vertices for the massive spin 5/2 field and massless spin 2 field with two and three derivatives are obtained. In dimension greater that four, we demonstrate that the gravitational vertex of the massive spin 5/2 field involves, in addition to the standard minimal gravitational vertex, contributions with two and three derivatives. We find that for the massive spin 5/2 and massless spin 2 fields one can build two higher-derivative vertices with two and three derivatives. Limits of massless and partial massless spin 5/2 fields in (A)dS space and limits of massive and massless spin 5/2 fields in flat space are discussed.