# Minimal signatures of the Standard Model in non-Gaussianities

## TL;DR

This paper explores how inflaton-Standard Model fermion interactions during inflation induce electroweak symmetry breaking and produce distinctive non-Gaussian oscillations, offering potential observable signatures in future cosmological surveys.

## Contribution

It introduces a one-parameter model linking inflaton coupling to fermions with unique non-Gaussian features and a direct relation between fermion masses and inflationary signals.

## Key findings

- Fermion production during inflation induces electroweak symmetry breaking.
- Distinct oscillating non-Gaussian signatures are predicted, especially from the top quark.
- Potential observability of signals in future 21-cm cosmological surveys.

## Abstract

We show that the leading coupling between a shift symmetric inflaton and the Standard Model fermions leads to an induced electroweak symmetry breaking due to particle production during inflation, and as a result, a unique oscillating feature in non-Gaussianities. In this one parameter model, the enhanced production of Standard Model fermions dynamically generates a new electroweak symmetry breaking minimum, where the Higgs field classically rolls into. The production of fermions stops when the Higgs expectation value and hence the fermion masses become too large, suppressing fermion production. The balance between the above-mentioned effects gives the Standard Model fermions masses that are uniquely determined by their couplings to the inflaton. In particular, the heaviest Standard Model fermion, the top quark, can produce a distinct cosmological collider physics signature characterised by a one-to-one relation between amplitude and frequency of the oscillating signal, which is observable at future 21-cm surveys.