Equivalence principle and experimental tests of gravitational spin effects

TL;DR

This paper explores experimental tests of the equivalence principle in spin-gravity interactions, providing new bounds and proposing methods to detect spin effects due to Earth's gravity and rotation.

Contribution

It offers the first experimental bound on anomalous gravitomagnetic moments and suggests new experimental approaches to detect spin-gravity effects.

Findings

First experimental bound on anomalous gravitomagnetic moment.

Potential detection of spin coupling effects at neutron EDM and g-2 experiments.

Earth's rotation influences optical experiments searching for axionlike particles.

Abstract

We study the possibility of experimental testing the manifestations of equivalence principle in spin-gravity interactions. We reconsider the earlier experimental data and get the first experimental bound on anomalous gravitomagnetic moment. The spin coupling to the Earth's rotation may also be explored at the extensions of neutron EDM and g-2 experiments. The spin coupling to the terrestrial gravity produces a considerable effect which may be discovered at the planned deuteron EDM experiment. The Earth's rotation should also be taken into account in optical experiments on a search for axionlike particles.