摘要: In the presence of background fields that spontaneously violate Lorentz invariance,
a matter-antimatter asymmetry can be generated even in thermal equilibrium.
In this paper we systematically investigate models of this type, showing that either
high-energy or electroweak versions of baryogenesis are possible, depending on the
dynamics of the Lorentz-violating fields. In addition to the previously-studied models
of spontaneous baryogenesis and quintessential baryogenesis, we identify two scenarios
of interest: baryogenesis from a weak-scale pseudo-Nambu-Goldstone boson
with intermediate-scale baryon-number violation, and sphaleron-induced baryogenesis
driven by a constant-magnitude vector with a late-time phase transition.