Models of baryogenesis via spontaneous Lorentz violation

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 pseudo-Nambu-Goldstone boson with weak-scale mass and intermediate-scale baryon-number violation, and sphaleron-induced baryogenesis driven by a constant-magnitude vector with a late-time phase transition.

98.80.Cq
baryon: production
baryon: asymmetry
violation: Lorentz
spontaneous symmetry breaking
background field: vector
baryon number: violation
Goldstone particle
sphaleron: effect
critical phenomena

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