Work

Geometric Baryogenesis from Shift Symmetry

Year: 2017

Type: article

Abstract: 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 axionlike fields. In these cases, the axion induces baryogenesis in the early Universe and can also serve as dark matter in the late Universe.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.118.131101

Authors: Andrea De Simone, Takeshi Kobayashi, Stefano Liberati

Institutions: Scuola Internazionale Superiore di Studi Avanzati, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: John Templeton Foundation, Instituto Nazionale di Fisica Nucleare

Award: Probing the emergent spacetime fabric: from theory to phenomenology