Testing relativity in the lab: Xin, Jack, Hong Ming, and Matt’s paper on measuring the gravitational redshift in the lab at the millimeter scale published in Nature Communications!

Congratulations to Xin, Jack, Hong Ming, and Matt on the publication of their paper “A lab-based test of the gravitational redshift with a miniature clock network” in Nature Communications! You can read the entire published paper at this link (with no paywall or special access required): https://rdcu.be/djkVc.

In this paper, we experimentally confirm that time passes more slowly for a clock that is just 2.5 millimeters higher off the ground than another otherwise identical clock, as predicted by Einstein’s theory of general relativity. Observing this effect and confirming that it is there required comparing to clocks at 19 digits of precision and accuracy!