Fast flavor conversion of neutrinos in presence of matter bulk velocity
arXiv:2108.00012
Abstract
A dense gas of neutrinos and antineutrinos can undergo fast pairwise conversions near the decoupling regions of core-collapse supernovae and in compact binary neutron star mergers. The flavor dependent neutrino heating can play a role in sustaining convection inside the hot and dense matter. In this paper, we study the unexplored effect of the bulk velocity of matter on fast pairwise conversions and demonstrate that depending on the direction and the magnitude of the bulk velocity, neutrino flavor conversions could be significantly enhanced or suppressed. The bulk velocity of matter, which is usually neglected in the context of neutrino oscillations, can reach values of one-tenth of the speed of light in astrophysical environments. We find that bulk velocities much smaller than the maximum allowed velocities can substantially change the neutrino flavor conversion rate. The demonstration of possible enhancement of neutrino flavor conversion rate due to the bulk velocity of matter also raises several important issues that are of relevance in the supernova mechanism. Future studies with realistic velocity profiles could elucidate the possible implications on the phenomenology of core-collapse supernovae and neutron star mergers.
13 pages, 18 figures
References in corpus (19)
- Simulation of Coherent Non-Linear Neutrino Flavor Transformation in the Supernova Environment I: Correlated Neutrino Trajectories
- Fast Pairwise Conversion of Supernova Neutrinos: A Dispersion-Relation Approach
- Coherent Development of Neutrino Flavor in the Supernova Environment
- The multi-angle instability in dense neutrino systems
- Neutrino oscillations in supernovae: angular moments and fast instabilities
- Imprints of neutrino-pair flavor conversions on nucleosynthesis in ejecta from neutron-star merger remnants
- Neutrino Fast Flavor Conversions in Neutron-star Post-Merger Accretion Disks
- Fast Neutrino Flavor Instability in the Neutron-star Convection Layer of Three-dimensional Supernova Models
- Fast neutrino flavor instability and neutrino flavor lepton number crossings
- Fast neutrino flavor conversion, ejecta properties, and nucleosynthesis in newly-formed hypermassive remnants of neutron-star mergers
- Flavor instabilities in the neutrino line model
- Fast oscillations, collisionless relaxation, and spurious evolution of supernova neutrino flavor
- A change of direction in pairwise neutrino conversion physics: The effect of collisions
- Fast flavor conversions in supernovae: the rise of mu-tau neutrinos
- Turbulence effects on supernova neutrinos
- Neutrino Flavor Evolution in Binary Neutron Star Merger Remnants
- Turbulent Supernova Shock Waves and the Sterile Neutrino Signature in Megaton Water Detectors
- The three flavor revolution in fast pairwise neutrino conversion
- Symmetry breaking induced by pairwise conversion of neutrinos in compact sources