Limit on Lorentz-Invariance- and CPT-Violating Neutron Spin Interactions Using a ${}^3$He-${}^{129}$Xe Comagnetometer

Fabian Allmendinger, Ulrich Schmidt, Werner Heil +2

We performed a search for a Lorentz-invariance- and CPT-violating coupling of the ${}^3$He and ${}^{129}$Xe nuclear spins to posited background fields. Our experimental approach is to…