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• W1550675318 abstract "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). Neutrino oscillations have been proven beyond reasonable doubt by the observation of the solar and atmospheric neutrino anomalies. The solar neutrino problem can be explained by oscillations between νe and νµ [1], whereas the atmospheric neutrino deficit is quite nicely explained by oscillations between νµ and ν� [2]. However, the LSND experiment also claims detection of neutrino oscillations between νµ and νe, but with a much larger mass difference than found from the solar neutrino experiments [3]. There is no possible threeneutrino solution to the combined data. Either one of the interpretations is wrong, or there is a fourth neutrino species, responsible for either the atmospheric or the solar neutrino anomaly. It has proven difficult to rule out the existence of such a fourth neutrino. It cannot interact via the usual weak interactions, or it would have been detected in Z-decay experiments. However, such additional light sterile neutrinos are predicted to exist in many extensions of the standard model, and it is certainly worthwhile to study the implications of such neutrinos for cosmology. Active-sterile neutrino oscillations in the early universe have been intensely studied for more than a decade. The pioneering studies concentrated on effects from excitation of inert degrees of freedom from the background plasma on BBN predictions of the abundances of the light elements [4-10]. Extra degrees of freedom exited before the BBN epoch increases the relativistic energy density of the universe. This modifies the expansion rate of the universe and changes the outcome of BBN, most notably the primordial helium abundance, YP." @default.
• W1550675318 created "2016-06-24" @default.
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• W1550675318 date "2000-12-15" @default.
• W1550675318 modified "2023-09-27" @default.
• W1550675318 title "On the Chaoticity of active-sterile neutrino oscillations in the early universe" @default.
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