Conformal symmetry and the cosmological constant problem

TL;DR

This paper explores how classical conformal symmetry in gravity and matter theories can reduce fine-tuning and stabilize the cosmological constant against scale changes, offering a potential solution to the cosmological constant problem.

Contribution

It demonstrates that conformal symmetry can significantly lessen fine-tuning and ensure stability of the cosmological constant in gravitational theories.

Findings

Fine-tuning of the cosmological constant is reduced with conformal symmetry.

The cosmological constant remains stable under scale transformations.

Conformal symmetry offers a promising approach to the cosmological constant problem.

Abstract

We argue that, when a theory of gravity and matter is endowed with (classical) conformal symmetry, the fine tuning required to obtain the cosmological constant at its observed value can be significantly reduced. Once tuned, the cosmological constant is stable under a change of the scale at which it is measured.