Related references
Note: Only part of the references are listed.
Article
Astronomy & Astrophysics
Shin-ichiro Fujimoto et al.
Summary: In this study, we investigate the impact of fast neutrino-flavour conversion (FFC) on explosive nucleosynthesis in core-collapse supernovae by including its effects in nucleosynthetic computations. It is found that FFC has little effect on the ejecta compositions for elements lighter than Co, but influences the heavier elements. The role of FFC varies depending on the degree of asymmetric neutrino emission and flavour mixing. Our results suggest that FFC facilitates the production of neutron-rich ejecta in most cases, but may make the ejecta proton-rich if anti-neutrino conversion is more vigorous than neutrino conversion, which can be quantified by simple diagnostics.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Akira Harada et al.
Summary: This paper investigates the impact of stellar rotation on fast flavor conversion in core-collapse supernovae. The study finds that rotation facilitates the occurrence of electron neutrino lepton number crossings, leading to changes in the angular distribution of neutrinos in momentum space.
ASTROPHYSICAL JOURNAL
(2022)
Review
Astronomy & Astrophysics
Francesco Capozzi et al.
Summary: This review summarizes the challenging open problem of neutrino flavor conversions in dense astrophysical environments, highlighting its theoretical and phenomenological implications in cosmology and astrophysics. The focus is on three environments: early Universe, core-collapse supernovae, and compact binary mergers.
Article
Astronomy & Astrophysics
Sajad Abbar et al.
Summary: Neutrinos in dense neutrino media can undergo fast flavor conversions caused by backward scattering off nuclei at relatively large distances. However, these instabilities are unlikely to cause significant flavor conversions if the population of neutrinos in the backward direction is not large enough.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Multidisciplinary
Ian Padilla-Gay et al.
Summary: In core-collapse supernovae or compact binary merger remnants, neutrino-neutrino refraction can lead to fast pair conversion. By analogizing the motion equations to that of a gyroscopic pendulum, we innovate by identifying the characteristic of the lepton-number angle distribution and predicting the depth of flavor conversion.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Hiroki Nagakura et al.
Summary: In this letter, the authors present large-scale simulations of fast neutrino-flavor conversion (FFC) in spherical symmetry. They use a novel approach to effectively rescale the oscillation scale of FFC and find that FFC reaches a quasisteady state in the nonlinear regime in all models. They also observe that temporal- and spatial variations of FFC are smeared out at large radii due to phase cancellation through neutrino self-interactions. Lastly, they propose a new diagnostic quantity to assess the nonlinear saturation of FFC.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Soumya Bhattacharyya et al.
Summary: This paper investigates the fast collective flavor oscillations of dense clouds of neutrinos and antineutrinos and their effect on flavor depolarization. The study provides an accurate analytical estimate for the lower resting point of the oscillations and explores the relaxation mechanisms that cause the system to settle down. The extent of depolarization, its dependence on momentum and net lepton asymmetry, as well as its generalization to three flavors are also discussed. The paper concludes by prescribing approximate analytical recipes for the depolarized distributions and fluxes, which can be applied in supernova/nucleosynthesis simulations and supernova neutrino phenomenology.
Article
Astronomy & Astrophysics
Chinami Kato et al.
Summary: Research has found that there is cancellation between in-and outscatterings in the high-energy region of neutrino self-interactions, which effectively reduces the number of collisions and affects the dynamics of flavor conversions. Compared to the single-energy treatment, the multienergy treatment extends the lifetime of flavor conversions and leads to larger conversions.
Article
Astronomy & Astrophysics
Rodrigo Fernandez et al.
Summary: This study examines the impact of fast flavor instability (FFI) on long-term mass ejection from accretion disks formed after neutron star mergers. The simulations show that FFI can alter the average electron fraction of the disk outflow and affect the rate of mass ejection.
Article
Astronomy & Astrophysics
Sherwood Richers
Summary: Neutrinos can cause rapid flavor changes in supernovae and neutron star mergers, impacting their explosion mechanisms and enrichment of the universe. This study tests various instability tests and finds new methods for predicting instability more accurately.
Article
Astronomy & Astrophysics
Sherwood Richers et al.
Summary: The fast flavor instability (FFI) is expected to be widespread in core-collapse supernovae and neutron star mergers, with potential impacts on explosion mechanism, neutrino signals, mass outflows, and nucleosynthesis. Simulating a standardized test problem using five independent codes, we verify the faithful simulation of underlying quantum kinetic equations and quantify the numerical errors in each method, identifying their respective strengths.
Article
Astronomy & Astrophysics
Hiroki Nagakura
Summary: In this paper, we developed a new code called GRQKNT for studying the quantum kinetics of nonequilibrium neutrinos in various astrophysical phenomena. The code is based on a discrete-ordinate Sn method and finite-difference realization of mean-field quantum kinetic equation. We also implemented various spacetimes and collision terms in the code. Through extensive testing, we ensured the correctness of each module.
Article
Astronomy & Astrophysics
Oliver Just et al.
Summary: This study investigates the role of fast neutrino flavor conversion in black hole accretion disks formed in neutron-star mergers or collapsing stars. The results show that fast conversions enhance the cooling rates of the disk, reduce the electron fraction, and increase the production of elements in the rapid neutron-capture process. Additionally, fast conversions prolong the duration of the kilonova event.
Article
Astronomy & Astrophysics
Rasmus S. L. Hansen et al.
Summary: The study reveals that collisions play a significant role in enhancing or suppressing fast neutrino flavor conversion, depending on the initial angular distribution and the magnitude of flavor conversions.
Article
Astronomy & Astrophysics
Guenter Sigl
Summary: We investigate the spatial and temporal instabilities in collective neutrino oscillations induced by neutrino self-interactions, focusing on inhomogeneous systems with density profiles. Our simulations show that refractive effects from the medium and neutral current nonforward scattering off the background medium can strongly influence fast collective flavor transformations.
Article
Astronomy & Astrophysics
Hiroki Nagakura
Summary: This study presents a new method for retrieving energy spectra of all flavors of neutrinos from core-collapse supernovae using observed data without assuming analytic formulas. By employing three independent reaction channels and conducting joint analysis, precise energy spectra of all neutrino flavors at the source can be obtained.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Hiroki Nagakura et al.
Summary: The study reveals the physical origin of differences in neutrino signals between 1D and 3D supernova models is primarily due to proto-neutron-star convection. The temporal and angular variations play a key role in detecting neutrino signals in non-exploding models. Additionally, a large angular asymmetry in event rates is found, but the overall signal shows relatively modest asymmetry.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ian Padilla-Gay et al.
Summary: Fast pairwise conversions of neutrinos in neutron star merger remnants are found to be more prominent within localized regions above the remnant disk, but almost negligible in the polar region, according to the first sophisticated numerical solution presented. However, caution should be taken in interpreting these findings due to the approximations inherent in the setup, advocating for further research within a more realistic framework.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Multidisciplinary
Soumya Bhattacharyya et al.
Summary: Flavor-dependent neutrino emission is crucial for the evolution of a supernova, as highlighted by the theory of fast flavor depolarization presented in this paper. The study explains how neutrino flavor differences decrease due to diffusion to smaller angular scales and provides a method to compute depolarized fluxes, which can be an important input for supernova theory and neutrino phenomenology.
PHYSICAL REVIEW LETTERS
(2021)
Review
Physics, Nuclear
Irene Tamborra et al.
Summary: Neutrino-neutrino refraction plays a key role in flavor evolution in core-collapse supernovae, neutron star mergers, and the early Universe. Pairwise neutrino scattering can lead to collective flavor conversions, regulated by the neutrino number density and angular distributions of electron neutrinos and antineutrinos. Fast pairwise conversions, often overlooked, could impact the hydrodynamics of astrophysical sources and the synthesis of heavy elements near the neutrino decoupling region.
ANNUAL REVIEW OF NUCLEAR AND PARTICLE SCIENCE, VOL 71, 2021
(2021)
Article
Physics, Multidisciplinary
Xinyu Li et al.
Summary: Research suggests that accretion disks formed during neutron star mergers are important sites for rapid neutron-capture nucleosynthesis, potentially leading to red kilonova emissions. The outflows from these disks may contain lanthanide and 3rd-peak r-process abundances similar to solar abundances.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Huaiyu Duan et al.
Summary: This study investigates flavor oscillations of fast neutrinos in core-collapse supernovae or binary neutron star mergers, finding nontrivial solutions through numerical calculations and nonlinear analysis. The results suggest the existence of a coherent flavor isospin wave similar to a magnetic spin wave in a lattice of magnetic dipoles.
Article
Astronomy & Astrophysics
Sherwood Richers et al.
Summary: The flavor instabilities of neutrinos can potentially affect core-collapse supernovae and heavy element ejection from neutron star mergers. Analytic methods suggest the presence of fast flavor transformations, with simulations indicating potential instability suppression in the presence of symmetry. Nonetheless, the equilibrium distribution of flavor seems little affected by spatial dimensions, hinting at the robustness of predictions against such variations in simulations.
Article
Astronomy & Astrophysics
Meng-Ru Wu et al.
Summary: Numerical simulations were conducted to study fast collective neutrino flavor conversions, revealing the formation of small scale structures due to the interaction of flavor waves under different initial conditions. The results show nearly flavor depolarization in a certain neutrino phase space, providing insights for astrophysical simulations and highlighting the need for better analytical understanding of the evolution of fast flavor conversions.
Article
Astronomy & Astrophysics
Masamichi Zaizen et al.
Summary: This paper discusses the collective neutrino oscillations and fast flavor conversion in core-collapse supernovae due to self-interactions of neutrinos. Numerical computations in the preshock region demonstrate that fast flavor conversion can have a significant impact in this area.
Article
Astronomy & Astrophysics
Hiroki Nagakura et al.
Summary: This study investigates the occurrence of fast flavor conversion in core-collapse supernovae (CCSNe) by analyzing electron neutrino lepton number (ELN) crossings in state-of-the-art three-dimensional CCSN models. It is found that fast flavor conversion generally occurs in the postshock region of CCSNe, with explosive models providing more favorable conditions than failed CCSNe. The analysis distinguishes between common and progenitor-dependent characteristics of ELN crossings, and identifies key ingredients driving the flavor conversions in CCSNe dynamics.
Article
Astronomy & Astrophysics
Hiroki Nagakura et al.
Summary: A new method for searching for ELN crossings in CCSN simulations has been developed, improving accuracy with ray-tracing neutrino transport to efficiently detect appearance/disappearance of crossings, even in forward-peaked angular distributions.
Article
Astronomy & Astrophysics
Hiroki Nagakura et al.
Summary: The study introduces a novel method to construct angular distributions of neutrinos, showcasing its application in CCSN models and assessing the reliability of two-moment neutrino transport for ELN-crossing searches. It reveals that systematic errors in the angular distributions of incoming neutrinos can lead to misjudgments of crossings in previous studies, casting doubt on their results.
Article
Astronomy & Astrophysics
Lucas Johns et al.
Summary: The study focuses on the impact of fast flavor instabilities on supernova and neutron-star-merger neutrinos, aiming to pinpoint when and where these instabilities occur. Although fast instabilities are linked to neutrino angular crossings, simulations often lack momentum-space angular resolution, posing a challenge in effectively utilizing limited angular information.
Article
Astronomy & Astrophysics
Sajad Abbar et al.
Summary: The study identifies the occurrence of fast neutrino flavor instabilities in core-collapse supernova simulations, highlighting the impact of scattering on these instabilities. It also suggests that the failure to achieve a successful explosion in heavier supernova models may hinder the occurrence of fast instabilities in the post-shock region.
Article
Astronomy & Astrophysics
Joshua D. Martin et al.
Summary: Our study investigates the impact of nonzero neutrino splitting and elastic neutrino-nucleon collisions on fast neutrino oscillations. We found that small neutrino mass splitting and the neutrino mass hierarchy have minimal effects on fast oscillation waves, which can propagate near the neutrino sphere essentially unimpeded but are damped on larger scales. This damping is due to modifications in the dispersion relation of the oscillation waves in the neutrino medium and flattening of the neutrino angular distributions over time.
Article
Astronomy & Astrophysics
Francesco Capozzi et al.
Summary: This study investigates the impact of muons and their interactions with neutrinos on fast flavor conversions in dense environments, notably observing fast instabilities in the μ-τ sector. One-dimensional simulations reveal that crossings below the supernova shock are a relatively common feature, contrary to previous literature. The importance of multidimensional simulations with muon creation is highlighted for future research.
Article
Astronomy & Astrophysics
Joshua D. Martin et al.
Article
Astronomy & Astrophysics
Sajad Abbar
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Physics, Multidisciplinary
Taiki Morinaga et al.
PHYSICAL REVIEW RESEARCH
(2020)
Article
Astronomy & Astrophysics
Lucas Johns et al.
Article
Astronomy & Astrophysics
Manu George et al.
Article
Astronomy & Astrophysics
Soumya Bhattacharyya et al.
Article
Astronomy & Astrophysics
Robert Glas et al.
Article
Astronomy & Astrophysics
Milad Delfan Azari et al.
Article
Astronomy & Astrophysics
Shashank Shalgar et al.
ASTROPHYSICAL JOURNAL
(2019)
Article
Astronomy & Astrophysics
Hiroki Nagakura et al.
ASTROPHYSICAL JOURNAL
(2019)
Article
Astronomy & Astrophysics
Joshua D. Martin et al.
Article
Astronomy & Astrophysics
Basudeb Dasgupta et al.
Article
Astronomy & Astrophysics
Basudeb Dasgupta et al.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2017)
Article
Physics, Multidisciplinary
Ignacio Izaguirre et al.
PHYSICAL REVIEW LETTERS
(2017)
Article
Astronomy & Astrophysics
Meng-Ru Wu et al.
Article
Astronomy & Astrophysics
Meng-Ru Wu et al.
Article
Physics, Particles & Fields
Sovan Chakraborty et al.
Article
Astronomy & Astrophysics
Basudeb Dasgupta et al.
Article
Astronomy & Astrophysics
Sajad Abbar et al.
Review
Physics, Nuclear
Huaiyu Duan et al.
ANNUAL REVIEW OF NUCLEAR AND PARTICLE SCIENCE, VOL 60
(2010)
Article
Astronomy & Astrophysics
Huaiyu Duan et al.
Review
Astronomy & Astrophysics
AS Dighe et al.
