The importance of flavor in leptogenesis
By E. Nardi, Y. Nir, E. Roulet, J. Racker. 2006
475 citations recorded by the source corpus.
We study leptogenesis from the out-of-equilibrium decays of the lightest heavy neutrino N1 in the medium (low) temperature regime, T1012 GeV (109 GeV), where the rates of processes mediated by the τ (and μ) Yukawa coupling are non negligible, implying that the effects of lepton flavors must be taken into account. We find important quantitative and qualitative differences with respect to the case where flavor effects are ignored: (i) The cosmic baryon asymmetry can be enhanced by up to one order of magnitude; (ii) The sign of the asymmetry can be opposite to what one would predict from the sign of the total lepton asymmetry 1; (iii) Successful leptogenesis is possible even with 1 = 0.
Subfields: Genetics, Molecular Biology
View Paper: https://www.semanticscholar.org/paper/59c421e30d988d0dca3b29858b2640a4b969f859
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Citations in the corpus
- Flavour matters in leptogenesis (2006, background): “We can have different possible cases according to which interaction mediated by the charged Yukawa couplings is in equilibrium, [8, 14].”
- Baryogenesis from the weak scale to the grand unification scale (2020, background): “In general, flavor effects can have an important impact on leptogenesis (Barbieri et al., 2000; Endoh et al., 2004; Abada et al., 2006; Nardi et al., 2006b; Blanchet et al., 2007).”
- Leptogenesis (2008, unknown): “1, starting from a specific set of parameters within a given seesaw model, the inclusion of flavour effects in the calculation of the baryon asymmetry can change the result by factors of a few to orders of magnitude [52, 53].”
- Leptogenesis in the Universe (2012, background): “[69], leptogenesis with a vanishing total CP asymmetry i = 0 also becomes possible.”
- The Phenomenology of Right Handed Neutrinos (2013, background): “The importance of flavour has been realized in [395] and [396–399] and meanwhile been studied by various authors, see [388, 389] for details and references.”
- Flavor structures of charged fermions and massive neutrinos (2019, result): “The CP-violating asymmetry between Ni → `α + H and Ni → `α + H decays in the early Universe provides a natural possibility of generating an intriguing lepton-antilepton asymmetry.”