Baryogenesis through collapsing string loops in gauged baryon and lepton models
Abstract
A scenario for the generation of the baryon asymmetry in the early Universe is proposed in which cosmic string loops, predicted by theories where the baryon and/or lepton numbers are gauged symmetries, collapse during the friction-dominated period of string evolution. This provides a mechanism for the departure from thermal equilibrium necessary to have a nonvanishing baryon asymmetry. Examples of models are given where this idea can be implemented. In particular, the model with the gauge symmetry SU(3)c⊗SU(2)L⊗U(1)Y⊗U(1)B⊗U(1)L has the interesting feature where sphaleron processes do not violate the baryon and lepton numbers so that no washout of any initial baryon asymmetry occurs at the electroweak scale.
- Publication:
-
Physical Review D
- Pub Date:
- April 1994
- DOI:
- 10.1103/PhysRevD.49.3837
- arXiv:
- arXiv:hep-ph/9306336
- Bibcode:
- 1994PhRvD..49.3837L
- Keywords:
-
- 98.80.Cq;
- 11.15.Kc;
- 11.27.+d;
- 12.10.Dm;
- Particle-theory and field-theory models of the early Universe;
- Classical and semiclassical techniques;
- Extended classical solutions;
- cosmic strings domain walls texture;
- Unified theories and models of strong and electroweak interactions;
- High Energy Physics - Phenomenology
- E-Print:
- 21 pages, LaTeX, PURD-TH-93-09, SISSA 87/93/A