A First Experimental Limit on In-matter Torsion from Neutron Spin Rotation in Liquid He-4

Abstract

We report the first experimental upper bound to our knowledge on possible in-matter torsion interactions of the neutron from a recent search for parity violation in neutron spin rotation in liquid He-4. Our experiment constrains a coefficient $\zeta$ consisting of a linear combination of parameters involving the time components of the torsion fields $T^{\mu }$ and $A^{\mu }$ from the nucleons and electrons in helium which violates parity. We report an upper bound of $|\zeta |<9.1x10^{-23}$ GeV at 68% confidence level and indicate other physical processes that could be analyzed to constrain in-matter torsion.

12 pages, typo corrected

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