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2016

Geometric Baryogenesis from Shift Symmetry

De Simone, Andrea, Kobayashi, Takeshi, Liberati, Stefano

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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.

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