An Advanced Leakage Scheme for Neutrino Treatment in Astrophysical Simulations

Perego, Albino; Cabezón, Rubén M.; Käppeli, Roger

doi:10.3847/0067-0049/223/2/22

Cited by 86 publications

(116 citation statements)

References 128 publications

(154 reference statements)

Supporting

Mentioning

112

Contrasting

Order By: Relevance

“…Our leakage scheme integrates out spectral information, assuming Fermi-Dirac distributions at the local temperature (with chemical potentials estimated as in [22]), although we can estimate an average energy of emitted neutrinos from the total luminosity and number emission rate. (See [16,63] for approximate ways, not pursued in this study, to incorporate absorption and spectral information in a leakage framework.) Our leakage scheme includes β-capture processes, e þ − e − pair annihilation, plasmon decay and nucleon-nucleon Bremsstrahlung interactions.…”

Section: Initial State a Input Physicsmentioning

confidence: 99%

Evolution of the magnetized, neutrino-cooled accretion disk in the aftermath of a black hole-neutron star binary merger

et al. 2018

View full text Add to dashboard Cite

Black hole-torus systems from compact binary mergers are possible engines for gamma-ray bursts (GRBs). During the early evolution of the postmerger remnant, the state of the torus is determined by a combination of neutrino cooling and magnetically driven heating processes, so realistic models must include both effects. In this paper, we study the postmerger evolution of a magnetized black hole-neutron star binary system using the Spectral Einstein Code (SpEC) from an initial postmerger state provided by previous numerical relativity simulations. We use a finite-temperature nuclear equation of state and incorporate neutrino effects in a leakage approximation. To achieve the needed accuracy, we introduce improvements to SpEC's implementation of general-relativistic magnetohydrodynamics (MHD), including the use of cubed-sphere multipatch grids and an improved method for dealing with supersonic accretion flows where primitive variable recovery is difficult. We find that a seed magnetic field triggers a sustained source of heating, but its thermal effects are largely cancelled by the accretion and spreading of the torus from MHD-related angular momentum transport. The neutrino luminosity peaks at the start of the simulation, and then drops significantly over the first 20 ms but in roughly the same way for magnetized and nonmagnetized disks. The heating rate and disk's luminosity decrease much more slowly thereafter. These features of the evolution are insensitive to grid structure and resolution, formulation of the MHD equations, and seed field strength, although turbulent effects are not fully converged.

show abstract

Section: Initial State a Input Physicsmentioning

confidence: 99%

Evolution of the magnetized, neutrino-cooled accretion disk in the aftermath of a black hole-neutron star binary merger

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Since supernovae are roughly spherically symmetric, they allow for approximations that are not admissible in a neutron star merger context. In this paper we extend the original ASL scheme to multi-dimensional applications, while keeping the general structure of the equations as presented in Perego et al (2014Perego et al ( , 2016. We examine the modified scheme in typical supernova and neutron star merger remnant snapshots.…”

Section: Introductionmentioning

confidence: 99%

A multidimensional implementation of the Advanced Spectral neutrino Leakage scheme

Gizzi

O’Connor

Rosswog

et al. 2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We present a new, multi-dimensional implementation of the Advanced Spectral Leakage (ASL) scheme with the purpose of modelling neutrino-matter interactions in neutron star mergers. A major challenge is the neutrino absorption in the semi-transparent regime which is responsible for driving winds from the merger remnant. Such winds are thought to be behind the blue emission component in the recently observed macronova following GW170817. Compared to the original version, we introduce an optical-depthdependent flux factor to model the average angle of neutrino propagation, and a modulation that accounts for flux anisotropies in non-spherical geometries. We scrutinise our approach by first comparing the new scheme against the original one for a spherically symmetric core-collapse supernova snapshot, both in 1D and in 3D, and additionally against a two-moment (M1) scheme as implemented in 1D into the code GR1D. The luminosities and mean energies agree to a few percents in most tests. Finally, we compare the new ASL scheme with the M1 scheme that is implemented in the Eulerian adaptive mesh refinement code FLASH. We find that the neutrino absorption distribution in the semi-transparent regime is overall well reproduced. Both approaches agree to within 15% for the average energies and to better than ∼ 35% in the total luminosities.

show abstract

“…[43,44]. The neutrino reactions included in the calculations are the emission, absorption and scattering off free nucleons.…”

Section: The Merger Remnantmentioning

confidence: 99%

Matter-neutrino resonance transitions above a neutron star merger remnant

2016

Self Cite

View full text Add to dashboard Cite

The Matter-Neutrino Resonance (MNR) phenomenon has the potential to significantly alter the flavor content of neutrinos emitted from compact object mergers. We present the first calculations of MNR transitions using neutrino self interaction potentials and matter potentials generated selfconsistently from a dynamical model of a three-dimensional neutron star merger. In the context of the single angle approximation, we find that Symmetric and Standard MNR transitions occur in both normal and inverted hierarchy scenarios. We examine the spatial regions above the merger remnant where propagating neutrinos will encounter the matter neutrino resonance and find that a significant fraction of the neutrinos are likely to undergo MNR transitions.

show abstract

An Advanced Leakage Scheme for Neutrino Treatment in Astrophysical Simulations

Cited by 86 publications

References 128 publications

Evolution of the magnetized, neutrino-cooled accretion disk in the aftermath of a black hole-neutron star binary merger

Evolution of the magnetized, neutrino-cooled accretion disk in the aftermath of a black hole-neutron star binary merger

A multidimensional implementation of the Advanced Spectral neutrino Leakage scheme

Matter-neutrino resonance transitions above a neutron star merger remnant

Contact Info

Product

Resources

About