Accelerating universe and the time-dependent fine-structure constant

TL;DR

This paper explores a theoretical link between the universe's acceleration and a changing fine-structure constant, using scalar-tensor theory to explain cosmic acceleration without fine-tuning.

Contribution

It proposes a novel relation connecting the accelerating universe with the time variation of the fine-structure constant within scalar-tensor frameworks.

Findings

Provides a theoretical basis for the variability of fundamental constants over cosmic time.

Offers an explanation for the small size of the effective cosmological constant without fine-tuning.

Highlights the physical principles underlying the universe's acceleration.

Abstract

Theoretical background of our proposed relation between the accelerating universe and the time-variability of the fine-structure constant is discussed, based on the scalar-tensor theory, with emphases on the intuitive aspects of underlying physical principles. An important comment is added on the successful understanding of the size of the effective cosmological constant responsible for the acceleration, without appealing to fine-tuning parameters.