Matter-wave Tests of the Gravitational Redshift in Space

TL;DR

This paper discusses how matter-wave interference experiments in space can significantly enhance tests of the gravitational redshift, potentially improving measurement precision by factors of up to 10^10.

Contribution

It introduces the concept of using space-based matter-wave experiments to vastly improve gravitational redshift measurements compared to ground-based tests.

Findings

Microgravity allows a 10^5 to 10^{10} times improvement in measurement accuracy.

Matter-wave interference is a viable method for testing gravitational effects in space.

Potential for new physics tests beyond current capabilities.

Abstract

A recent measurement of the gravitational redshift was based on interference of matter waves. Operation in microgravity can improve it by a factor of $10^5$ and, in some models, even $10^{10}$.