On the Observability of Collective Flavor Oscillations in Diffuse Supernova Neutrino Background

Abstract

Collective flavor oscillations are known to bring multiple splits in the supernova (SN) neutrino and antineutrino spectra. These spectral splits depend not only on the mass hierarchy of the neutrinos but also on the initial relative flux composition. Observation of spectral splits in a future galactic supernova signal is expected to throw light on the mass hierarchy pattern of the neutrinos. However, since the Diffuse Supernova Neutrino Background (DSNB) comprises of a superposition of neutrino fluxes from all past supernovae, and since different supernovae are expected to have slightly different initial fluxes, it is pertinent to check if the hierarchy dependent signature of collective oscillations can survive this averaging of the flux spectra. Since the actual distribution of SN with initial relative flux spectra of the neutrinos and antineutrinos is unknown, we assume a log-normal distribution for them. We study the dependence of the hierarchy sensitivity to the mean and variance of the log-normal distribution function. We find that the hierarchy sensitivity depends crucially on the mean value of the relative initial luminosity. The effect of the width is to reduce the hierarchy sensitivity for all values of the mean initial relative luminosity. We find that in the very small mixing angle (${\theta }_{13}$) limit considering only statistical errors even for very moderate values of variance, there is almost no detectable hierarchy sensitivity if the mean relative luminosities of ${\nu }_e$ and ${\bar{\nu }}_e$ are greater than 1.

9 pages, 5 figures, version matches published version in Phys.Lett.B

References in corpus (23)

• Simulation of Coherent Non-Linear Neutrino Flavor Transformation in the Supernova Environment I: Correlated Neutrino Trajectories
• Collective neutrino flavor transitions in supernovae and the role of trajectory averaging
• Multiple Spectral Splits of Supernova Neutrinos
• Role of dense matter in collective supernova neutrino transformations
• Analysis of Collective Neutrino Flavor Transformation in Supernovae
• Adiabaticity and spectral splits in collective neutrino transformations
• Decoherence in supernova neutrino transformations suppressed by deleptonization
• Neutrino Mass Hierarchy and Stepwise Spectral Swapping of Supernova Neutrino Flavors
• Neutrino-Neutrino Interactions and Flavor Mixing in Dense Matter
• Self-induced decoherence in dense neutrino gases
• Self-induced suppression of collective neutrino oscillations in a supernova
• Flavor Evolution of the Neutronization Neutrino Burst from an O-Ne-Mg Core-Collapse Supernova
• Simple Picture for Neutrino Flavor Transformation in Supernovae
• Collective neutrinos oscillation in matter and CP-violation
• Spectral split in prompt supernova neutrino burst: Analytic three-flavor treatment
• Stepwise Spectral Swapping with Three Neutrino Flavors
• Identifying neutrino mass hierarchy at extremely small theta(13) through Earth matter effects in a supernova signal
• Collective neutrino oscillations in non-spherical geometry
• Low-energy spectral features of supernova (anti)neutrinos in inverted hierarchy
• Detection potential for the diffuse supernova neutrino background in the large liquid-scintillator detector LENA
• A new, very massive modular Liquid Argon Imaging Chamber to detect low energy off-axis neutrinos from the CNGS beam. (Project MODULAr)
• Effect of Collective Flavor Oscillations on the Diffuse Supernova Neutrino Background
• Upper Limit on the Cosmic Gamma-Ray Burst Rate from High Energy Diffuse Neutrino Background

Cited by in corpus (12)

• Diffuse supernova neutrinos at underground laboratories
• Measuring the supernova unknowns at the next-generation neutrino telescopes through the diffuse neutrino background
• Stellar Collapse Diversity and the Diffuse Supernova Neutrino Background
• Fundamental physics with the diffuse supernova background neutrinos
• Diffuse supernova neutrinos: oscillation effects, stellar cooling and progenitor mass dependence
• Diffuse neutrinos from extragalactic supernova remnants: Dominating the 100 TeV IceCube flux
• The neutrino signal at HALO: learning about the primary supernova neutrino fluxes and neutrino properties
• Observing supernova neutrino light curve in future dark matter detectors
• Testing Lorentz invariance with neutrino bursts from supernova neutronization
• GR Effects in Supernova Neutrino Flavor Transformation
• Neutrino non-radiative decay and the diffuse supernova neutrino background
• New Insights into Uncertainties in the Relic Neutrino Background and Effects from the Nuclear Equation of State