We present a QCD axion model where the couplings of to nucleons, electrons, and muons are naturally suppressed because appropriate choice Peccei-Quinn charges Standard Model fermions. reexamine next-to-leading order corrections with nucleons photons show that decay constant may be as small $10^7$ GeV. It is also possible suppress coupling photon so even smaller minimal axiogenesis works. In thi...

The dark sector, composed of fields that are neutral under the standard model (SM) gauge group, can couple to SM through Higgs, hypercharge and neutrino portals, pull towards its scale by loop corrections. This instability, which is not possible prevent in known completions, such as supersymmetry, due sizable couplings SM, calls for alternative mechanisms neutralize sensitivities sector ultravi...