Geometric Baryogenesis from Shift Symmetry
  We present a new scenario for generating the baryon asymmetry of the universe
that is induced by a Nambu-Goldstone (NG) boson. The shift symmetry naturally
controls the operators in the theory, while allowing the NG boson to couple to
the spacetime geometry as well as to the baryons. The cosmological background
thus sources a coherent motion of the NG boson, which leads to baryogenesis.
Good candidates of the baryon-generating NG boson are the QCD axion and
axion-like fields. In these cases the axion induces baryogenesis in the early
universe, and can also serve as dark matter in the late universe.
