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research article

Quantum leptogenesis I

Anisimov, A.
•
Buchmueller, W.
•
Drewes, M.
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2011
Annals Of Physics

Thermal leptogenesis explains the observed matter-antimatter asymmetry of the universe in terms of neutrino masses, consistent with neutrino oscillation experiments. We present a full quantum mechanical calculation of the generated lepton asymmetry based on Kadanoff-Baym equations. Origin of the asymmetry is the departure from equilibrium of the statistical propagator of the heavy Majorana neutrino, together with CP violating couplings. The lepton asymmetry is calculated directly in terms of Green's functions without referring to "number densities". Compared to Boltzmann and quantum Boltzmann equations, the crucial difference are memory effects, rapid oscillations much faster than the heavy neutrino equilibration time. These oscillations strongly suppress the generated lepton asymmetry, unless the standard model gauge interactions, which cause thermal damping, are properly taken into account. We find that these damping effects essentially compensate the enhancement due to quantum statistical factors, so that finally the conventional Boltzmann equations again provide rather accurate predictions for the lepton asymmetry. (C) 2011 Elsevier Inc. All rights reserved.

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Type
research article
DOI
10.1016/j.aop.2011.02.002
Web of Science ID

WOS:000291910800009

Author(s)
Anisimov, A.
Buchmueller, W.
Drewes, M.
Mendizabal, S.
Date Issued

2011

Published in
Annals Of Physics
Volume

326

Start page

1998

End page

2038

Subjects

Thermal field theory

•

Nonequilibrium

•

Leptogenesis

•

Particle physics

•

Cosmology

•

Electroweak Baryogenesis

•

Transport-Equations

•

Kinetic Description

•

Chiral Fermions

•

Field-Theory

•

Order H

•

Asymmetry

•

Universe

•

Formalism

•

Decays

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
ITP  
Available on Infoscience
December 16, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/73943
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