New mechanism for leptogenesis

Abstract

Unified theories containing a $U(1{)}_{B-L}$ gauge symmetry predict heavy Majorana right-handed neutrinos. In such theories, cosmic strings may form at the $B-L$ breaking scale. If the Higgs field forming the strings is also the Higgs field which gives mass to the right-handed neutrinos, there are right-handed neutrinos trapped as transverse zero modes in the core of the strings. When cosmic string loops decay, they release these neutrinos. This is an out-of-equilibrium process. The released neutrinos acquire heavy Majorana mass and decay into massless leptons and electroweak Higgs particles to produce a lepton asymmetry, which is converted into a baryon asymmetry via sphaleron transitions.

9 pages, uses Revtex, includes one figure

References in corpus (2)

• A Supersymmetric SO(10) Model with Inflation and Cosmic Strings
• Constraining Supersymmetric SO(10) Models Through Cosmology

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