Measurability of the non-minimal coupling

TL;DR

This paper discusses the challenges in measuring the non-minimal coupling in gravity theories, concluding that for typical values, its effects are minimal and hard to detect.

Contribution

It provides an analysis of the measurability of non-minimal scalar couplings within the effective field theory of gravity, highlighting their small impact.

Findings

Non-minimal coupling introduces small corrections

Measurability of the coupling is limited for reasonable values

No strong motivation to exclude non-minimal coupling

Abstract

The "measurability" of the non-minimal coupling is discussed in the context of the effective field theory of gravity. Although there is no obvious motive for excluding a non-minimal scalar coupling from the theory, we conclude that for reasonable values of the coupling constant it makes only a very small correction.