Fast flavor oscillations in dense neutrino media with collisions

Abstract

We investigate the impact of the nonzero neutrino splitting and elastic neutrino-nucleon collisions on fast neutrino oscillations. Our calculations confirm that a small neutrino mass splitting and the neutrino mass hierarchy have very little effect on fast oscillation waves. We also demonstrate explicitly that fast oscillations remain largely unaffected for the time/distance scales that are much smaller than the neutrino mean free path but are damped on larger scales. This damping originates from both the direct modification of the dispersion relation of the oscillation waves in the neutrino medium and the flattening of the neutrino angular distributions over time. Our work suggests that fast neutrino oscillation waves produced near the neutrino sphere can propagate essentially unimpeded which may have ramifications in various aspects of the supernova physics.

12 pages, 6 figures

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• The Fast Flavor Instability in Hypermassive Neutron Star Disk Outflows
• Neutrino Fast Flavor Pendulum. Part 2: Collisional Damping
• Collisional instabilities of neutrinos and their interplay with fast flavor conversion in compact objects
• New method for detecting fast neutrino flavor conversions in core-collapse supernova models with two-moment neutrino transport
• Perturbing Fast Neutrino Flavor Conversion
• Applications of Machine Learning to Detecting Fast Neutrino Flavor Instabilities in Core-Collapse Supernova and Neutron Star Merger Models
• Quasi-steady evolution of fast neutrino-flavor conversions
• Fast Neutrino Conversion in Hydrodynamic Simulations of Neutrino-Cooled Accretion Disks