Leptogenesis with many neutrinos

Eisele, M.

doi:10.1103/physrevd.77.043510

Cited by 17 publications

(9 citation statements)

References 68 publications

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“…In contrast, the contribution of many singlets in weak washout can enhance the final baryon asymmetry, allowing thermal leptogenesis at T reheat that is a factor ∼30 lower than in the case of three singlet neutrinos [175]. In the case where leptogenesis is unflavoured, extra singlets weaken the upper bound on | | from 3M 1 [175,176]. 4.…”

Section: Cp Violation In N 1 Decaysmentioning

confidence: 82%

Leptogenesis

2008

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Leptogenesis is a class of scenarios where the baryon asymmetry of the Universe is produced from a lepton asymmetry generated in the decays of a heavy sterile neutrino. We explain the motivation for leptogenesis. We review the basic mechanism, and describe subclasses of models. We then focus on recent developments in the understanding of leptogenesis: finite temperature effects, spectator processes, and in particular the significance of flavor physics.Comment: 111 pages, 8 figures. Added Sect. 3 on anomalous B+L violation. Corrected equations (6.30) and (6.31). Added Sect. 9.1 with a simple example of the effects of flavours. Revised Sect. 10.1 on susy leptogenesis. Added several references, and other minor improvements. To be published in Physics Report

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Section: Cp Violation In N 1 Decaysmentioning

confidence: 82%

Leptogenesis

2008

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“…An upper limit on the KK masses M n (H i ) is set by the graviton bound [32,33], i.e. by the requirement that late decays should not spoil the production of light elements during Big Bang nucleosynthesis (BBN) at T BBN ∼ 0.3 MeV.…”

Section: Bounds On Yukawa Couplingsmentioning

confidence: 99%

Resonant Dirac leptogenesis on throats

Bechinger

Seidl

2010

Phys. Rev. D

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We consider resonant Dirac leptogenesis in a geometry with three five-dimensional throats in the flat limit. The baryon asymmetry in the universe is generated by resonant decays of heavy Kaluza-Klein scalars that are copies of the standard model Higgs. Discrete exchange symmetries between the throats are responsible for establishing two key features of the model. First, they ensure a near degeneracy of the scalar masses and thus a resonant decay of the scalars. This allows for Dirac leptogenesis at low energies close to the TeV scale. Second, the discrete symmetries connect the observed baryon asymmetry with the Yukawa couplings of the low-energy theory. As a consequence, we obtain correlations between the low-energy leptonic mixing parameters and the Dirac CP phase that can be tested at future neutrino oscillation experiments such as neutrino factories. †

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“…Let us also mention that meanwhile the many neutrino scenario has been analyzed in some detail. It has been found that many neutrinos somewhat relax the tension between leptogenesis and supersymmetry [112,113]. Furthermore, the presence of many neutrinos and their Yukawa couplings have important consequences for supersymmetric lepton flavor violation [113].…”

Section: How Good Are the Mini-landscape Models?mentioning

confidence: 99%

From strings to the MSSM

et al. 2008

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We review recent progress in embedding the supersymmetric standard model into string theory. We discuss how, with the incorporation of certain aspects of grand unification, a search strategy can be developed that allows to efficiently find rather large numbers of promising string vacua. Global string-derived models with the following features are discussed: (i) exact MSSM spectrum below the unification scale; (ii) R parity; (iii) hierarchical Yukawa couplings with nontrivial mixing; (iv) solution to the µ problem; (v) see-saw suppressed neutrino masses.a

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Leptogenesis with many neutrinos

Cited by 17 publications

References 68 publications

Leptogenesis

Leptogenesis

Resonant Dirac leptogenesis on throats

From strings to the MSSM

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