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2011

Leptogenesis via hypermagnetic fields and baryon asymmetry

Dvornikov, Maxim, Semikoz, Victor B.

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We study baryon asymmetry generation originated from the leptogenesis in the presence of hypermagnetic fields in the early Universe plasma before the electroweak phase transition (EWPT).

For the simplest Chern-Simons (CS) wave configuration of hypermagnetic field we find the baryon asymmetry growth when the hypermagnetic field value changes due to alpha^2-dynamo and the lepton asymmetry rises due to the Abelian anomaly.
We solve the corresponding integro-differential equations for the lepton asymmetries describing such self-consistent dynamics for lepto- and baryogenesis in the two scenarios : (i) when a primordial lepton asymmetry sits in right electrons e_R; and (ii) when, in addition to e_R, a left lepton asymmetry for e_L and nu_eL arises due to chirality flip reactions provided by inverse Higgs decays at the temperatures, T<T_RL ~ 10 TeV.
We find that the baryon asymmetry of the Universe (BAU) rises very fast through such leptogenesis, especially, in strong hypermagnetic fields.

Leptogenesis via hypermagnetic fields and baryon asymmetry · Around

Built on

A. N. Redlich and L. C. R. Wijewardhana, Induced Chern-Simons terms at high temperatures and finite densities
1985
Earlier work this paper cites.
B. A. Campbell, S. Davidson, J. Ellis and K. A. Olive, On the baryon, lepton-flavor and right-handed electron asymmetries of the universe
1992
Earlier work this paper cites.
M. Giovannini and M. E. Shaposhnikov, Primordial Hypermagnetic Fields and Triangle Anomaly
1998
Earlier work this paper cites.
D. Grasso and H. R. Rubinstein, Magnetic Fields in the Early Universe
2001
Earlier work this paper cites.

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Then

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