Baryon asymmetry from hypermagnetic helicity in dilaton hypercharge electromagnetism
Abstract
The generation of the baryon asymmetry of the Universe from the hypermagnetic helicity, the physical interpretation of which is given in terms of hypermagnetic knots, is studied in inflationary cosmology, taking into account the breaking of the conformal invariance of hypercharge electromagnetic fields through both a coupling with the dilaton and with a pseudoscalar field. It is shown that, if the electroweak phase transition is strongly first order and the present amplitude of the generated magnetic fields on the horizon scale is sufficiently large, a baryon asymmetry with a sufficient magnitude to account for the observed baryon-to-entropy ratio can be generated.
- Publication:
-
Physical Review D
- Pub Date:
- December 2006
- DOI:
- 10.1103/PhysRevD.74.123504
- arXiv:
- arXiv:hep-ph/0611152
- Bibcode:
- 2006PhRvD..74l3504B
- Keywords:
-
- 98.80.Cq;
- 11.30.Fs;
- 98.62.En;
- Particle-theory and field-theory models of the early Universe;
- Global symmetries;
- Electric and magnetic fields;
- High Energy Physics - Phenomenology;
- Astrophysics;
- High Energy Physics - Theory
- E-Print:
- 16 pages, 2 figures, a reference added, typos corrected