Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-03-03
JCAP 0606:012,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
v2 (23 pages, including 6 eps figures). Typos removed, references updated, matches the published version
Scientific paper
10.1088/1475-7516/2006/06/012
Supernova neutrino flavor transitions during the shock wave propagation are known to encode relevant information not only about the matter density profile but also about unknown neutrino properties, such as the mass hierarchy (normal or inverted) and the mixing angle theta_13. While previous studies have focussed on "deterministic" density profiles, we investigate the effect of possible stochastic matter density fluctuations in the wake of supernova shock waves. In particular, we study the impact of small-scale fluctuations on the electron (anti)neutrino survival probability, and on the observable spectra of inverse-beta-decay events in future water-Cherenkov detectors. We find that such fluctuations, even with relatively small amplitudes, can have significant damping effects on the flavor transition pattern, and can partly erase the shock-wave imprint on the observable time spectra, especially for sin^2(theta_13) > O(10^-3).
Fogli Gian Luigi
Lisi Eligio
Mirizzi Alessandro
Montanino Daniele
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