A Self-Tuning Solution of the Cosmological Constant Problem

TL;DR

This paper proposes a self-tuning mechanism in a five-dimensional model that dynamically addresses the cosmological constant problem without fine-tuning or singularities, maintaining four-dimensional Poincare invariance.

Contribution

It introduces a scalar field coupled to the Standard Model that forms a smooth brane, providing a novel self-tuning solution to the cosmological constant problem.

Findings

Achieves a smooth brane with four-dimensional Poincare invariance

Operates independently of Standard Model physics

Avoids singularities and fine-tuning issues

Abstract

We discuss the four-dimensional cosmological constant problem in a five-dimensional setting. A scalar field coupled to the SM forms dynamically a smooth brane with four-dimensional Poincare invariance, independently of SM physics. In this respect, our solution may be regarded as a self-tuning solution, free of any singularities and fine-tuning problems.