Astronomical and laboratory searches for space-time variation of fundamental constants

TL;DR

This paper reviews recent efforts to detect potential variations in fundamental constants like the fine-structure constant through astronomical and laboratory methods, highlighting recent evidence and challenges in confirming such variations.

Contribution

It provides a comprehensive overview of current observational and experimental approaches, emphasizing recent findings and promising systems for detecting variations in fundamental constants.

Findings

Evidence suggests possible spatial variation in alpha

Certain quasar systems show enhanced sensitivity to variations

Laboratory measurements face significant accuracy challenges

Abstract

We review recent activity searching for variations in the fundamental constants of nature in quasar absorption spectra and in the laboratory. While research in this direction has been ongoing for many decades, the topic has recently been stimulated by astronomical evidence for spatial variation in the fine-structure constant, alpha. This result could be confirmed using different quasar data and atomic clock measurements, but there are significant challenges to obtain the required accuracy. We review existing measurements and discuss some of the most promising systems where any variations would be strongly enhanced.