Generation of Large Lepton Asymmetries
J. A. Casas, Wai Yan Cheng, G. B. Gelmini
Abstract
We present here a realistic model to produce a very large lepton asymmetry L of 0.1 to 1, without producing a large baryon asymmetry. The model is based on the Affleck and Dine scenario, in which the field acquiring a large vacuum expectation value during inflation is a s-neutrino right. We require L to be large enough for the electroweak symmetry to be spontaneously broken at all temperatures after inflation, with the consequent suppression of sphaleron transitions.
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