Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-09-15
Phys. Rev. Lett. 108, 031301 (2012)
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Final version to appear in Phys. Rev. Lett. Minor changes, references added
Scientific paper
10.1103/PhysRevLett.108.031301
We show that the evolution of magnetic fields in a primordial plasma, filled with Standard Model particles, at temperatures T > 10 MeV is strongly affected by the quantum chiral anomaly -- an effect that has been neglected previously. Although reactions equilibrating left and right-chiral electrons are in deep thermal equilibrium for T < 80 TeV, an asymmetry between these particle develops in the presence of strong magnetic fields. This results in magnetic helicity transfer from shorter to longer scales. This also leads to an effective generation of lepton asymmetry that may survive in the plasma down to temperatures T ~ 10 MeV, which may strongly affect many processes in the early Universe. Although we report our results for the Standard Model, they are likely to play an important role also in its extensions.
Boyarsky Alexey
Froehlich Juerg
Ruchayskiy Oleg
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