Long-range axion forces and hadronic CP violation

Abstract

Axions and other pseudoscalar fields comprise an interesting class of ultralight dark matter candidates, that may independently play a role in solving the strong $CP$ problem. In the presence of $CP$-violating sources, these pseudoscalar fields can develop a coherent non-derivative coupling to nucleons, ${\bar{g}}_{aNN}$, thus mediating `mass-mass' and `mass-spin' forces in matter that can be probed experimentally. We revisit the non-perturbative generation of these $CP$-odd axion forces, and refine estimates of ${\bar{g}}_{aNN}$ generated by the EDMs and color EDMs of quarks. We also revisit the Standard Model contribution to $CP$-odd axion couplings generated by the phase of the Cabibbo-Kobayashi-Maskawa quark mixing matrix.

9 pages, 2 figures; v2: references added, version published in PRD

References in corpus (4)

• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Limits on a CP-violating scalar axion-nucleon interaction
• Cornering the axion with CP-violating interactions
• $\theta$-dependence of light nuclei and nucleosynthesis

Cited by in corpus (12)

• Axion Couplings in Grand Unified Theories
• Evaporation Barrier for Dark Matter in Celestial Bodies
• CP-violating axion interactions in effective field theory
• The Chiral Lagrangian of CP-Violating Axion-Like Particles
• Wake forces in a background of quadratically coupled mediators
• Leading bounds on micro- to picometer fifth forces from neutron star cooling
• CP-violating axion interactions II: axions as Dark Matter
• Constraining CP violating nucleon-nucleon long range interactions in diatomic eEDM searches
• Imperfect Axion Precludes the Domain Wall Problem
• Dark Matter Raining on DUNE and Other Large Volume Detectors
• Axion Window on New Macroscopic Forces
• Detecting the QCD axion via the ferroaxionic force with piezoelectric materials