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Title

On the full Boltzmann equations for leptogenesis

AuthorsGarayoa, Julia ; Pastor, Sergio ; Pinto Cejas, Teguayco ; Rius, Nuria ; Vives, Óscar
Keywordsleptogenesis
neutrino theory
physics of the early universe
Issue Date28-Sep-2009
PublisherInstitute of Physics Publishing
CitationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (9): 035 (2009)
AbstractWe consider the full Boltzmann equations for standard and soft leptogenesis, instead of the usual integrated Boltzmann equations which assume kinetic equilibrium for all species. Decays and inverse decays may be inefficient for thermalising the heavy-(s)neutrino distribution function, leading to significant deviations from kinetic equilibrium. We analyse the impact of using the full kinetic equations in the case of a previously generated lepton asymmetry, and find that the washout of this initial asymmetry due to the interactions of the right-handed neutrino is larger than when calculated via the integrated equations. We also solve the full Boltzmann equations for soft leptogenesis, where the lepton asymmetry induced by the soft SUSY-breaking terms in sneutrino decays is a purely thermal effect, since at T=0 the asymmetry in leptons cancels the one in sleptons. In this case, we obtain that in the weak washout regime (K ~< 1) the final lepton asymmetry can change up to a factor four with respect to previous estimates.
Publisher version (URL)http://dx.doi.org/10.1088/1475-7516/2009/09/035
URIhttp://hdl.handle.net/10261/20751
DOI10.1088/1475-7516/2009/09/035
ISSN1475-7516
Appears in Collections:(IFIC) Artículos
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