Relaxation from particle production

TL;DR

This paper proposes a novel relaxation mechanism for the electroweak hierarchy problem using particle production as a friction force, avoiding superplanckian fields and conflicts with the strong CP problem, adaptable to various inflationary scenarios.

Contribution

It introduces a new particle production-based relaxation method that circumvents previous limitations like superplanckian excursions and strong CP conflict.

Findings

Avoids superplanckian field excursions

Compatible with various inflationary timelines

Provides a new approach to the hierarchy problem

Abstract

We consider using particle production as a friction force by which to implement a "Relaxion" solution to the electroweak hierarchy problem. Using this approach, we are able to avoid superplanckian field excursions and avoid any conflict with the strong CP problem. The relaxation mechanism can work before, during or after inflation allowing for inflationary dynamics to play an important role or to be completely decoupled.