Constraints on axionlike dark matter with masses down to $10^{-23}$ eV/c${}^2$

William A. Terrano, Eric G. Adelberger, Charles A. Hagedorn +1

We analyzed an 6.7-year span of data from a rotating torsion-pendulum containing $\approx 10^{23}$ polarized electrons to search for the "wind" arising from ultralight, axionlike d…