16 citations · 35 across the 17 of their papers we have counts for
17 papers
Dynamic Competition of Fast and Collisional Neutrino Flavor Instabilities with Collisional Damping in Spatially Inhomogeneous Systems
Shota Takahashi, Hiroki Nagakura, Masamichi Zaizen +2
Neutrino flavor evolution in dense astrophysical environments such as core-collapse supernova (CCSN) is influenced by collective effects. While the Fast Flavor Instability (FFI) an…
Fast Neutrino-Flavor Conversion with Attenuation and Global Lepton Gradient
Masamichi Zaizen, Hiroki Nagakura
Fast neutrino-flavor conversion (FFC) can nontrivially alter neutrino radiation field in core-collapase supernovae (CCSN) and binary neutron-star merger (BNSM) remnants. However, i…
Approximate Energy-Integration Method for Identifying Collisional Neutrino Flavor Instabilities
Jiabao Liu, Hiroki Nagakura
We present an approximate energy-integration method for identifying collisional neutrino flavor instabilities. Direct evaluation of the dispersion relation requires multi-dimension…
Bifurcated Impact of Neutrino Fast Flavor Conversion on Core-collapse Supernovae Informed by Multi-angle Neutrino Radiation Hydrodynamics
Ryuichiro Akaho, Hiroki Nagakura, Wakana Iwakami +6
In this {\it Letter}, we present a compelling and robust argument for the roles of neutrino fast flavor conversion (FFC) in the explosion mechanism of core-collapse supernova (CCSN…
Dynamical equilibria of fast neutrino flavor conversion
Jiabao Liu, Lucas Johns, Hiroki Nagakura +2
Dense neutrino systems, which display collectivity mediated by the weak interaction, have deep parallels with mean-field kinetic systems governed by other fundamental forces. We id…
Reconciling the Tension Between Light Curve Modeling of Type II Supernovae and Neutrino-Driven Core-Collapse Supernovae Models with Late-Phase Spectroscopy
Qiliang Fang, Hiroki Nagakura, Takashi J. Moriya
Type II supernovae (SNe II) are the most frequently observed outcome of core-collapse explosions and provide a valuable window into the physical mechanisms governing the deaths of…
The Effect of the Collisional Flavor Instability on Core-Collapse Supernova Models
Tianshu Wang, Hiroki Nagakura, Lucas Johns +1
We explore the effects of the neutrino collisional flavor instability (CFI) based on 1D and 2D core-collapse supernova (CCSN) simulations done using the sophisticated radiation-hyd…
Neutrino flavor instabilities in a binary neutron star merger remnant: Roles of a long-lived hypermassive neutron star
Hiroki Nagakura, Kohsuke Sumiyoshi, Sho Fujibayashi +2
Understanding the post-merger evolution of binary neutron star merger (BNSM) requires accurate modeling of neutrino transport and microphysics including neutrino flavor conversions…
Asymptotic states of fast neutrino-flavor conversions in the three-flavor framework
Jiabao Liu, Hiroki Nagakura, Masamichi Zaizen +2
There has been growing evidence that mu and tau neutrinos are noticeably different due to the emergence of muons in core-collapse supernovae (CCSNe) and binary neutron star mergers…
Resolution requirements for numerical modeling of neutrino quantum kinetics
Hiroki Nagakura, Masamichi Zaizen, Jiabao Liu +1
Neutrino quantum kinetics is a rapidly evolving field in computational astrophysics, with a primary focus on collective neutrino oscillations in core-collapse supernovae and post-m…
Inspecting neutrino flavor instabilities during proto-neutron star cooling phase in supernova: I. Spherically symmetric model
Masamichi Zaizen, Sherwood Richers, Hiroki Nagakura +2
In the standard model of core-collapse supernova (CCSN), all neutrinos are assumed to be in pure flavor eigenstates in CCSN cores, but the assumption becomes invalid if neutrino di…
The effects of surface fossil magnetic fields on massive star evolution: V. Models at low metallicity
Z. Keszthelyi, J. Puls, G. Chiaki +4
At metallicities lower than that of the Small Magellanic Cloud, it remains essentially unexplored how fossil magnetic fields, forming large-scale magnetospheres, could affect the e…
Machine Learning-Based Detection of Non-Axisymmetric Fast Neutrino Flavor Instabilities in Core-Collapse Supernovae
Sajad Abbar, Akira Harada, Hiroki Nagakura
In dense neutrino environments like core-collapse supernovae (CCSNe) and neutron star mergers (NSMs), neutrinos can undergo fast flavor conversions (FFC) when their angular distrib…
Neutron star kick driven by asymmetric fast-neutrino flavor conversion
Hiroki Nagakura, Kohsuke Sumiyoshi
Multi-dimensional nature of core-collapse supernova (CCSN) leads to asymmetric matter ejection and neutrino emission, that potentially accounts for the origin of neutron star (NS)…
BGK subgrid model for neutrino quantum kinetics
Hiroki Nagakura, Lucas Johns, Masamichi Zaizen
We present a new subgrid model for neutrino quantum kinetics, which is primarily designed to incorporate effects of collective neutrino oscillations into neutrino-radiation-hydrody…
Fast neutrino-flavor swap in high-energy astrophysical environments
Masamichi Zaizen, Hiroki Nagakura
We assert that non-linear features of fast neutrino-flavor conversion (FFC) can be qualitatively different between core-collapse supernovae (CCSNe) and binary neutron star mergers…
Detecting Fast Neutrino Flavor Conversions with Machine Learning
Sajad Abbar, Hiroki Nagakura
Neutrinos in dense environments like core-collapse supernovae (CCSNe) and neutron star mergers (NSMs) can undergo fast flavor conversions (FFCs) once the angular distribution of ne…