140 citations · 996 across the 20 of their papers we have counts for
20 papers
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…
Protoneutron Star Convection Simulated with a New General Relativistic Boltzmann Neutrino Radiation-Hydrodynamics Code
Ryuichiro Akaho, Akira Harada, Hiroki Nagakura +6
We investigate the protoneutron star (PNS) convection using our newly developed general relativistic Boltzmann neutrino radiation-hydrodynamics code. This is a pilot study for more…
Principal-Axis Analysis of the Eddington Tensor for the Early Post-Bounce Phase of Rotational Core-Collapse Supernovae
Wakana Iwakami, Akira Harada, Hiroki Nagakura +6
Using full Boltzmann neutrino transport, we performed two-dimensional (2D) core-collapse supernova simulations in axisymmetry for two progenitor models with 11.2M and 15.0M both ro…
Multidimensional Boltzmann Neutrino Transport Code in Full General Relativity for Core-collapse Simulations
Ryuichiro Akaho, Akira Harada, Hiroki Nagakura +6
We develop a neutrino transfer code for core-collapse simulations, that directly solves the multidimensional Boltzmann equations in full general relativity. We employ the discrete…
Simulations of the Early Post-Bounce Phase of Core-Collapse Supernovae in Three-Dimensional Space with Full Boltzmann Neutrino Transport
Wakana Iwakami, Hirotada Okawa, Hiroki Nagakura +5
We report on the core-collapse supernova simulation we conducted for a 11.2 M progenitor model in three-dimensional space up to 20 ms after bounce, using a radiation hydrodynamics…
The Boltzmann-radiation-hydrodynamics Simulations of Core-collapse Supernovae with Different Equations of State: the Role of Nuclear Composition and the Behavior of Neutrinos
Akira Harada, Hiroki Nagakura, Wakana Iwakami +5
Using the Boltzmann-radiation-hydrodynamics code, which solves the Boltzmann equation for neutrino transport, we present the results of the simulations with the nuclear equations o…
Fast collective neutrino oscillations inside the neutrino sphere in core-collapse supernovae
Milad Delfan Azari, Shoichi Yamada, Taiki Morinaga +6
Neutrinos are believed to have a key role in the explosion mechanism of core-collapse supernovae as they carry most of the energy released by the gravitational collapse of a massiv…
Linear Analysis of Fast-Pairwise Collective Neutrino Oscillations in Core-Collapse Supernovae based on the Results of Boltzmann Simulations
Milad Delfan Azari, Shoichi Yamada, Taiki Morinaga +4
Neutrinos are densely populated deep inside the core of massive stars after their gravitational collapse to produce supernova explosions and form compact stars such as neutron star…
On the Neutrino Distributions in Phase Space for the Rotating Core-collapse Supernova Simulated with a Boltzmann-neutrino-radiation-hydrodynamics Code
Akira Harada, Hiroki Nagakura, Wakana Iwakami +5
With the Boltzmann-radiation-hydrodynamics code, which we have developed to solve numerically the Boltzmann equations for neutrino transfer, the Newtonian hydrodynamics equations,…
A Parametric Study of the Acoustic Mechanism for Core-Collapse Supernovae
A. Harada, H. Nagakura, W. Iwakami +1
We investigate the criterion for the acoustic mechanism to work successfully in core-collapse supernovae. The acoustic mechanism is an alternative to the neutrino-heating mechanism…
Simulations of core-collapse supernovae in spatial axisymmetry with full Boltzmann neutrino transport
Hiroki Nagakura, Wakana Iwakami, Shun Furusawa +6
We present the first results of our spatially axisymmetric core-collapse supernova simulations with full Boltzmann neutrino transport, which amount to a time-dependent 5-dimensiona…
Three-dimensional Boltzmann-Hydro code for core-collapse in massive stars II. The Implementation of moving-mesh for neutron star kicks
Hiroki Nagakura, Wakana Iwakami, Shun Furusawa +4
We present a newly developed moving-mesh technique for the multi-dimensional Boltzmann-Hydro code for the simulation of core-collapse supernovae (CCSNe). What makes this technique…
Links between the shock instability in core-collapse supernovae and asymmetric accretions of envelopes
Kazuya Takahashi, Wakana Iwakami, Yu Yamamoto +1
The explosion mechanism of core-collapse supernovae has not been fully understood yet but multi-dimensional fluid instabilities such as standing accretion shock instability (SASI)…
Critical Surface for Explosions of Rotational Core-Collapse Supernovae
Wakana Iwakami, Hiroki Nagakura, Shoichi Yamada
The effect of rotation on the explosion of core-collapse supernovae is investigated systematically in three-dimensional simulations. In order to obtain the critical conditions for…
Parametric Study of Flow Patterns behind the Standing Accretion Shock Wave for Core-Collapse Supernovae
Wakana Iwakami, Hiroki Nagakura, Shoichi Yamada
In this study, we conduct three-dimensional hydrodynamic simulations systematically to investigate the flow patterns behind the accretion shock waves that are commonly formed in th…
New Approach for Error Reduction in the Volume Penalization Method
Wakana Iwakami, Yuzuru Yatagai, Nozomu Hatakeyama +1
A new approach for reducing error of the volume penalization method is proposed. The mask function is modified by shifting the interface between solid and fluid by (νη)^0.5 toward…
Ray-Tracing Analysis of Anisotropic Neutrino Radiation for Estimating Gravitational Waves in Core-Collapse Supernovae
Kei Kotake, Wakana Iwakami, Naofumi Ohnishi +1
We propose a ray-tracing method to estimate gravitational waves (GWs) generated by anisotropic neutrino emission in supernova cores. To calculate the gravitational waveforms, we de…
Stochastic Nature of Gravitational Waves from Supernova Explosions with Standing Accretion Shock Instability
Kei Kotake, Wakana Iwakami, Naofumi Ohnishi +1
We study properties of gravitational waves based on the three-dimensional simulations, which demonstrate the neutrino-driven explosions aided by the standing accretion shock instab…
Effects of Rotation on Standing Accretion Shock Instability in Nonlinear Phase for Core-Collapse Supernovae
Wakana Iwakami, Kei Kotake, Naofumi Ohnishi +2
We studied the effects of rotation on standing accretion shock instability (SASI) by performing three-dimensional hydrodynamics simulations. Taking into account a realistic equatio…
Three-Dimensional Simulations of Standing Accretion Shock Instability in Core-Collapse Supernovae
Wakana Iwakami, Kei Kotake, Naofumi Ohnishi +2
We have studied non-axisymmetric standing accretion shock instability, or SASI, by 3D hydrodynamical simulations. This is an extention of our previous study on axisymmetric SASI. W…