# Dark energy without fine tuning

## TL;DR

This paper introduces a two-field model that unifies inflation and dark energy, addressing fine-tuning issues in quintessence models by linking dark energy to electroweak symmetry breaking.

## Contribution

It proposes a novel two-field framework that naturally explains dark energy without fine-tuning, connecting it to electroweak scale physics.

## Key findings

- Model naturally suppresses interactions with other fields.
- Dark energy magnitude set by electroweak scale.
- Minimal sensitivity to initial conditions.

## Abstract

We present a two-field model that realises inflation and the observed density of dark energy today, whilst solving the fine-tuning problems inherent in quintessence models. One field acts as the inflaton, generically driving the other to a saddle-point of the potential, from which it acts as a quintessence field following electroweak symmetry breaking. The model exhibits essentially no sensitivity to the initial value of the quintessence field, naturally suppresses its interactions with other fields, and automatically endows it with a small effective mass in the late Universe. The magnitude of dark energy today is fixed by the height of the saddle point in the potential, which is dictated entirely by the scale of electroweak symmetry breaking.