Baryon asymmetry from hypermagnetic helicity in dilaton hypercharge electromagnetism
نویسنده
چکیده
Abstract 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.
منابع مشابه
Electroweak baryogenesis induced by a scalar field
A cosmological pseudoscalar field coupled to hypercharge topological number density can exponentially amplify hyperelectric and hypermagnetic fields while coherently rolling or oscillating, leading to the formation of a timedependent condensate of topological number density. The topological condensate can be converted, under certain conditions, into baryons in sufficient quantity to explain the...
متن کاملHypermagnetic Knots, Chern-Simons Waves and the Baryon Asymmetry
In a globally neutral plasma, the transversality of the magnetic fields implies, at high conductivity, the conservation of both magnetic flux and magnetic helicity. The plasma element evolves always glued together with magnetic flux lines whose number of associated knots and twists does not change . The energetical and the topological properties of the magnetic flux lines are conserved in the s...
متن کاملElectroweak baryogenesis and primordial hypermagnetic fields
The origin of the matter-antimatter asymmetry of the universe remains one of the outstanding questions yet to be answered by modern cosmology and also one of only a handful of problems where the need of a larger number of degrees of freedom than those contained in the standard model (SM) is better illustrated. An appealing scenario for the generation of baryon number is the electroweak phase tr...
متن کاملBaryogenesis from a Primordial Lepton Asymmetry
Abstract We examine the generation of baryon asymmetry at the weak scale from a primordial lepton asymmetry. If the electroweak phase transition is first order, partial reflection of tau leptons off the bubble walls and the resulting hypercharge transport into the symmetric phase, gives rise to a baryon number consistent with observation.We examine the generation of baryon asymmetry at the weak...
متن کاملPrimordial hypermagnetic fields and the triangle anomaly
The high-temperature plasma above the electroweak scale ;100 GeV may have contained a primordial hypercharge magnetic field whose anomalous coupling to the fermions induces a transformation of the hypermagnetic energy density into fermionic number. In order to describe this process, we generalize the ordinary magnetohydrodynamical equations to the anomalous case. We show that a not completely h...
متن کامل