Preferred-Frame and CP-Violation Tests with Polarized Electrons
read the original abstract
We used a torsion pendulum containing $\approx 10^{23}$ polarized electrons to search new interactions that couple to electron spin. We limit CP-violating interactions between the pendulum's electrons and unpolarized matter in the earth or the sun, test for rotation and boost-dependent preferred-frame effects using the earth's rotation and velocity with respect to the entire cosmos, and search for exotic velocity-dependent potentials between polarized electrons and unpolarized matter in the sun and moon. Finally, we find that the gravitational mass of an electron spinning toward the galactic center differs by less than about 1 part in $10^{21}$ from an electron spinning in the opposite direction. As a byproduct of this work, the density of polarized electrons in Sm$ $Co$_5$ was measured to be $(4.19\pm 0.19)\times 10^{22} {\rm cm}^{-3}$ at a field of 9.6 kG.
This paper has not been read by Pith yet.
Forward citations
Cited by 3 Pith papers
-
Searching for ultralight bosons with Josephson junction interferometry
Josephson junctions can detect ultralight boson potentials through induced phase shifts, enabling probes of photophilic scalars, Lorentz-violating scalars, and axion monopole-dipole interactions depending on source po...
-
Potential of constraining the Fifth Force Using the Earth as a Spin and Mass Source from space
Theoretical proposal for a spacecraft-Earth experiment to constrain spin- and velocity-dependent fifth forces mediated by ultralight vector bosons, claiming up to three orders of magnitude improvement over current bounds.
-
Comagnetometer probes of dark matter and new physics
The paper reviews comagnetometry as a sensitive probe for new physics including EDMs, Lorentz violation, CP-violating forces, and axionic dark matter, while discussing prospects for further sensitivity gains based on ...
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.