True QCD axion dark matter cannot induce observable neutron-antineutron oscillations, because its Goldstone nature forces competing axionless baryon-number-violating effects that are already ruled out.
Neutron-Antineutron Oscillation as a Signal of CP Violation
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abstract
Assuming the Lorentz and CPT invariances we show that neutron-antineutron oscillation implies breaking of CP along with baryon number violation -- i.e. two of Sakharov conditions for baryogenesis. The oscillation is produced by the unique operator in the effective Hamiltonian. This operator mixing neutron and antineutron preserves charge conjugation C and breaks P and T. External magnetic field always leads to suppression of oscillations. Its presence does not lead to any new operator mixing neutron and antineutron.
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Dark-matter induced neutron-antineutron oscillations
True QCD axion dark matter cannot induce observable neutron-antineutron oscillations, because its Goldstone nature forces competing axionless baryon-number-violating effects that are already ruled out.