Large neutrino asymmetries from neutrino oscillations

Foot, R.; Thomson, Mark J.; Volkas, Raymond R.

doi:10.1103/physrevd.53.r5349

Cited by 187 publications

(335 citation statements)

References 31 publications

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“…However, later it was found that the asymmetry can increase significantly and reach values O(0.1) [8]. This finding was confirmed by elaborate numerical calculations [9,10,11].…”

Section: Introductionsupporting

confidence: 61%

Maximum lepton asymmetry from active-sterile neutrino oscillations in the early Universe

Buras¹,

Semikoz²

2001

Phys. Rev. D

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A large lepton asymmetry could be generated in the Early Universe by oscillations of active to sterile neutrinos with a small mixing angle sin 2θ < 10 −2 . The final order of magnitude of the lepton asymmetry η is mainly determined by its growth in the last stage of evolution when the MSW resonance dominates the kinetic equations. In this paper we present a simple way of calculating the maximum possible lepton asymmetry which can be created. Our results are in good agreement to previous calculations. Furthermore, we find that the growth of asymmetry does not obey any particular power law. We find that the maximum possible asymmetry at the freeze-out of the n/p ratio at T ∼ 1 MeV strongly depends on the mass-squared difference δm 2 : the asymmetry is negligible for |δm 2 | ≪ 1 eV 2 and reaches asymptotically large values for |δm 2 | ∼ > 50 eV 2

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“…However, later it was found that the asymmetry can increase significantly and reach values O(0.1) [8]. This finding was confirmed by elaborate numerical calculations [9,10,11].…”

Section: Introductionsupporting

confidence: 61%

Maximum lepton asymmetry from active-sterile neutrino oscillations in the early Universe

Buras¹,

Semikoz²

2001

Phys. Rev. D

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“…The evolution of the different flavor states, taking into account oscillations and coherence-destroying thermal interactions, can be performed in a unified framework using the density matrix formalism [12,21,22]. The system begins in some state ρ 0 , where the diagonal components give the iniital relative abundances of each particle type and the off-diagonal components represent any coherences present in the initial state.…”

Section: Mass Mixing Formalismmentioning

confidence: 99%

Emergent dark matter, baryon, and lepton numbers

Cui¹,

Randall²,

Shuve³

2011

J. High Energ. Phys.

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We present a new mechanism for transferring a pre-existing lepton or baryon asymmetry to a dark matter asymmetry that relies on mass mixing which is dynamically induced in the early universe. Such mixing can succeed with only generic scales and operators and can give rise to distinctive relationships between the asymmetries in the two sectors. The mixing eliminates the need for the type of additional higherdimensional operators that are inherent to many current asymmetric dark matter models. We consider several implementations of this idea. In one model, mass mixing is temporarily induced during a two-stage electroweak phase transition in a two Higgs doublet model. In the other class of models, mass mixing is induced by large field vacuum expectation values at high temperatures -either moduli fields or even more generic kinetic terms. Mass mixing models of this type can readily accommodate asymmetric dark matter masses ranging from 1 GeV to 100 TeV and expand the scope of possible relationships between the dark and visible sectors in such models.

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“…However, judging from the results of Ref. [48] it has yet to be shown that with c s close to one a realistic scenario meeting all experimental constraints can actually be achieved in scheme A and we leave this problem to future investigation.…”

Section: Bbn Constraints On 4-neutrino Mixingmentioning

confidence: 99%

“…[48]. There it has been shown that for a certain range of the mixing parameters and for resonant transitions due to ∆m 2 SBL a lepton asymmetry as small as 10 −10 can be amplified up to 10 −2 and in this way transitions at a lower temperature (like the transitions due to ∆m 2 atm in the schemes under consideration) can be prevented.…”

Section: Bbn Constraints On 4-neutrino Mixingmentioning

confidence: 99%

Four-neutrino mixing and Big-Bang Nucleosynthesis

Bilenky¹,

Giunti²,

Grimus³

et al. 1999

Astroparticle Physics

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We investigate the Big-Bang Nucleosynthesis constraints on neutrino mixing in the framework of the two four-neutrino schemes that are favored by the results of neutrino oscillation experiments. We discuss the implications of these constraints for terrestrial short and long-baseline neutrino oscillation experiments and we present some possibilities of testing them in these experiments. In particular, we show that from the Big-Bang Nucleosynthesis constraints it follows that the (−) ν µ → (−) ν τ transition is severely suppressed in short-baseline experiments, whereas its oscillation amplitude in long-baseline experiments is of order 1. We also propose a new parameterization of the four-neutrino mixing matrix U which is appropriate for the schemes under consideration.

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Large neutrino asymmetries from neutrino oscillations

Cited by 187 publications

References 31 publications

Maximum lepton asymmetry from active-sterile neutrino oscillations in the early Universe

Maximum lepton asymmetry from active-sterile neutrino oscillations in the early Universe

Emergent dark matter, baryon, and lepton numbers

Four-neutrino mixing and Big-Bang Nucleosynthesis

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