Baryon asymmetry from hypermagnetic helicity in dilaton hypercharge electromagnetism

Details Baryon asymmetry from hypermagnetic helicity in dilaton hypercharge electromagnetism Baryon asymmetry from hypermagnetic helicity in dilaton hypercharge electromagnetism

2006-11-11

arxiv.org/abs/hep-ph/0611152v2

Phys.Rev.D74:123504,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 2 figures, a reference added, typos corrected

Scientific paper

10.1103/PhysRevD.74.123504

The generation of the baryon asymmetry of the Universe (BAU) 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 that with a pseudoscalar field. It is shown that if the electroweak phase transition (EWPT) 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.

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