Spontaneous Lorentz Violation and Baryogenesis

Details Spontaneous Lorentz Violation and Baryogenesis Spontaneous Lorentz Violation and Baryogenesis

2007-11-15

arxiv.org/abs/0711.2519v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

Contributed to 4th Meeting on CPT and Lorentz Symmetry (CPT 07), Bloomington, Indiana, August 8-11. References added for the n

Scientific paper

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. 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.

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