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T: Fachverband Teilchenphysik
T 41: Neutrinophysik (Theorie)
T 41.8: Vortrag
Montag, 24. März 2014, 18:30–18:45, P108
Sterile neutrino altered dispersion relations in Cosmology and Astrophysics — •Elke Aeikens and Heinrich Päs — TU Dortmund, Deutschland
Altered dispersion relations can arise from various effects such as Lorentz violation, shortcuts in extra dimensions and standard or non-standard matter effects. We analyze the effects of sterile neutrino altered dispersion relations on the flavor ratios of astrophysical neutrinos and on big bang nucleosynthesis (BBN). On the one hand additional relativistic degrees of freedom in the early Universe typically interfere with the successful prediction of the cosmological 4He abundance. Altered dispersion relations can avoid this consequence by suppressing active-sterile neutrino mixing and thus the population of sterile neutrinos in the early Universe. On the other hand altered dispersion relations can affect the flavor ratios of astrophysical neutrino sources. We discuss the bounds obtained and possible observations for various dispersion relations.