Nambu-Goldstone Affleck-Dine Baryogenesis. (arXiv:1906.05286v1 [hep-ph])

<a href="http://arxiv.org/find/hep-ph/1/au:+Harigaya_K/0/1/0/all/0/1">Keisuke Harigaya</a>

The Affleck-Dine mechanism creates the baryon asymmetry of the universe from

an angular motion of a complex scalar field. The mechanism is efficient and

allows for a low reheating temperature of the universe if the scalar field has

a flat potential along its radial direction. We consider a possibility where

the scalar field is a pseudo-Nambu-Goldstone boson arising from spontaneous

breaking of an approximate global symmetry, so that the flatness of the

potential is naturally understood. We construct a concrete realization of the

idea based on chiral symmetry breaking in an SU(N) gauge theory. The

Peccei-Quinn mechanism can be consistently incorporated into the model. We also

comment on a possible impact of the model on early universe physics.

The Affleck-Dine mechanism creates the baryon asymmetry of the universe from

an angular motion of a complex scalar field. The mechanism is efficient and

allows for a low reheating temperature of the universe if the scalar field has

a flat potential along its radial direction. We consider a possibility where

the scalar field is a pseudo-Nambu-Goldstone boson arising from spontaneous

breaking of an approximate global symmetry, so that the flatness of the

potential is naturally understood. We construct a concrete realization of the

idea based on chiral symmetry breaking in an SU(N) gauge theory. The

Peccei-Quinn mechanism can be consistently incorporated into the model. We also

comment on a possible impact of the model on early universe physics.

http://arxiv.org/icons/sfx.gif