# On the Inflationary Perturbations of Massive Higher-Spin Fields

## TL;DR

This paper explores how coupling massive higher-spin fields to the inflaton during inflation can produce observable cosmological perturbations that remain significant outside the Hubble radius, potentially revealing new signatures of inflation.

## Contribution

It demonstrates that appropriate couplings can stabilize higher-spin field perturbations, overcoming decay constraints imposed by the Higuchi bound, and suggests new observational possibilities.

## Key findings

- Perturbations can remain constant or decay slowly outside the Hubble radius.
- Couplings to the inflaton modify the decay behavior of higher-spin fields.
- Potential for new observational signatures from inflation.

## Abstract

Cosmological perturbations of massive higher-spin fields are generated during inflation, but they decay on scales larger than the Hubble radius as a consequence of the Higuchi bound. By introducing suitable couplings to the inflaton field, we show that one can obtain statistical correlators of massive higher-spin fields which remain constant or decay very slowly outside the Hubble radius. This opens up the possibility of new observational signatures from inflation.