Geometric Baryogenesis from Shift Symmetry
High Energy Physics - Phenomenology
2017-04-05 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Theory
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 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.
Keywords
Cite
@article{arxiv.1612.04824,
title = {Geometric Baryogenesis from Shift Symmetry},
author = {Andrea De Simone and Takeshi Kobayashi and Stefano Liberati},
journal= {arXiv preprint arXiv:1612.04824},
year = {2017}
}
Comments
6 pages, 1 figure; v2: published in PRL