Constraints on long-range spin-gravity and monopole-dipole couplings of the proton

Abstract

Results of a search for a long-range monopole-dipole coupling between the mass of the Earth and rubidium (Rb) nuclear spins are reported. The experiment simultaneously measures the spin precession frequencies of overlapping ensembles of ${}^{85}$Rb and ${}^{87}$Rb atoms contained within an evacuated, antirelaxation-coated vapor cell. The nuclear structure of the Rb isotopes makes the experiment particularly sensitive to spin-dependent interactions of the proton. The spin-dependent component of the gravitational energy of the proton in the Earth's field is found to be smaller than $3\times 10^{-18}\mathrm{eV}$, improving laboratory constraints on long-range monopole-dipole interactions by over three orders of magnitude.

arXiv comment10 pages, 8 figures

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