Imprints of Spinning Particles on Primordial Cosmological Perturbations

TL;DR

This paper investigates how light higher-spin particles during inflation could produce unique anisotropic signatures in primordial perturbations, using advanced theoretical tools like dS/CFT correspondence.

Contribution

It provides a novel characterization of anisotropic imprints from higher-spin particles during inflation, especially focusing on partially massless states, using operator product expansion techniques.

Findings

Derived generic signatures for higher-spin imprints on cosmological correlators.

Identified distinctive statistical anisotropies linked to partially massless higher-spin states.

Established a theoretical framework connecting higher-spin physics with inflationary perturbations.

Abstract

If there exist higher-spin particles during inflation which are light compared to the Hubble rate, they may leave distinct statistical anisotropic imprints on the correlators involving scalar and graviton fluctuations. We characterise such signatures using the dS/CFT$_3$ correspondence and the operator product expansion techniques. In particular, we obtain generic results for the case of partially massless higher-spin states.