## Constraining Spacetime Nonmetricity with Neutron Spin Rotation in Liquid He-4

General spacetime nonmetricity coupled to neutrons is studied. In this context, it is shown that certain nonmetricity components can generate a rotation of the neutron's spin. Available data on this effect obtained from slow-neutron propagation in liquid helium are used to constrain isotropic nonmetricity components at the level of $10^{-22}\,$GeV. These results represent the first limit on the nonmetricity $\zeta^{(6)}_2S_{000}$ parameter as well as the first measurement of nonmetricity inside matter.

Publication Date:
Sep 10 2017
Date Submitted:
Aug 10 2018
Pagination:
865-869
ISSN:
1873-2445
Citation:
Physics Letters B
772
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