On the chaoticity of active-sterile neutrino oscillations in the early universe

Poul-Erik Braad, Steen Hannestad

Publikation: Bidrag til tidsskriftTidsskriftartikelForskning

Resumé

We have investigated the evolution of the neutrino asymmetry in active-sterile neutrino oscillations in the early universe. We find that there are large regions of parameter space where the asymmetry is extremely sensitive to variations in the initial asymmetry as well as the external parameters (the mass difference and the mixing angle). In these regions the system undergoes chaotic transitions; however, the system is never truly chaotic in the sense that all information about initial conditions is lost. In some cases though, enough information is lost that the final sign of the neutrino asymmetry is stochastic. We discuss the implications of our findings for Big Bang nucleosynthesis (BBN) and the cosmic microwave background (CMB).
OriginalsprogUdefineret/Ukendt
Tidsskriftarxiv.org
Vol/bindhep-ph
Udgave nummer0012194
StatusUdgivet - 15. dec. 2000

Emneord

  • hep-ph
  • astro-ph

Citer dette

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On the chaoticity of active-sterile neutrino oscillations in the early universe. / Braad, Poul-Erik; Hannestad, Steen.

I: arxiv.org, Bind hep-ph, Nr. 0012194, 15.12.2000.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskning

TY - JOUR

T1 - On the chaoticity of active-sterile neutrino oscillations in the early universe

AU - Braad, Poul-Erik

AU - Hannestad, Steen

PY - 2000/12/15

Y1 - 2000/12/15

N2 - We have investigated the evolution of the neutrino asymmetry in active-sterile neutrino oscillations in the early universe. We find that there are large regions of parameter space where the asymmetry is extremely sensitive to variations in the initial asymmetry as well as the external parameters (the mass difference and the mixing angle). In these regions the system undergoes chaotic transitions; however, the system is never truly chaotic in the sense that all information about initial conditions is lost. In some cases though, enough information is lost that the final sign of the neutrino asymmetry is stochastic. We discuss the implications of our findings for Big Bang nucleosynthesis (BBN) and the cosmic microwave background (CMB).

AB - We have investigated the evolution of the neutrino asymmetry in active-sterile neutrino oscillations in the early universe. We find that there are large regions of parameter space where the asymmetry is extremely sensitive to variations in the initial asymmetry as well as the external parameters (the mass difference and the mixing angle). In these regions the system undergoes chaotic transitions; however, the system is never truly chaotic in the sense that all information about initial conditions is lost. In some cases though, enough information is lost that the final sign of the neutrino asymmetry is stochastic. We discuss the implications of our findings for Big Bang nucleosynthesis (BBN) and the cosmic microwave background (CMB).

KW - hep-ph

KW - astro-ph

M3 - Tidsskriftartikel

VL - hep-ph

JO - arxiv.org

JF - arxiv.org

IS - 0012194

ER -