Suppression of fast neutrino flavor conversions occurring at large distances in core-collapse supernovae
Mina Y. Girgis,Basil K Williams +1 more
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In this paper , it was shown that the fast flavor conversion of neutrinos propagating in dense neutrino media such as core-collapse supernovae and neutron star merger remnants can experience the so-called fast flavor conversions on scales much shorter than those expected in vacuum.Abstract:
Abstract Neutrinos propagating in dense neutrino media such as core-collapse supernovae and neutron star merger remnants can experience the so-called fast flavor conversions on scales much shorter than those expected in vacuum. A very generic class of fast flavor instabilities is the ones which are produced by the backward scattering of neutrinos off the nuclei at relatively large distances from the supernova core. In this study we demonstrate that despite their ubiquity, such fast instabilities are unlikely to cause significant flavor conversions if the population of neutrinos in the backward direction is not large enough. Indeed, the scattering-induced instabilities can mostly impact the neutrinos traveling in the backward direction, which represent only a small fraction of neutrinos at large radii. We show that this can be explained by the shape of the unstable flavor eigenstates, which can be extremely peaked at the backward angles. read more
Citations
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Journal ArticleDOI
Code comparison for fast flavor instability simulations
TL;DR: In this paper , the authors simulate a standardized test problem using five independent codes and verify that they are all faithfully simulating the underlying quantum kinetic equations under the assumptions of axial symmetry and homogeneity in two directions.
Book ChapterDOI
Fast Flavor Transformations
Sherwood Richers,Manibrata Sen +1 more
TL;DR: The neutrino fast flavor instability (FFI) as mentioned in this paper is a known phenomenon in supernovae and mergers that can change neutrinos flavor on time scales of nanoseconds and length scales of centimeters.
Journal ArticleDOI
Effects of energy-dependent scatterings on fast neutrino flavor conversions
TL;DR: In this paper , the authors performed dynamical simulations of fast neutrino flavor conversions with isoenergetic scatterings under multi-energy treatment and found that cancellation between in-and outscatterings happens in the high-energy region, which effectively reduces the number of collisions and then affects the FFC dynamics.
Journal ArticleDOI
Time-Dependent and Quasisteady Features of Fast Neutrino-Flavor Conversion
TL;DR: In this article , a large-scale simulation of fast neutrino-flavor conversion (FFC) in spherical symmetry is presented, and it is shown that FFC achieves a quasisteady state in the nonlinear regime, and its saturation property is universal.
Journal ArticleDOI
Self-consistency in models of neutrino scattering and fast flavor conversion
TL;DR: In this article , the effects of neutrino neutral-current scattering on fast flavor conversion (FFC) were investigated and the authors concluded that the enhancement effect is of unclear astrophysical relevance and may not occur in natural environments.
References
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