THE ISOTROPIC DIFFUSION SOURCE APPROXIMATION FOR SUPERNOVA NEUTRINO TRANSPORT
نویسندگان
چکیده
منابع مشابه
The Isotropic Diffusion Source Approximation for Supernova Neutrino Transport
Astrophysical observations originate from matter that interacts with radiation or transported particles. We develop a pragmatic approximation in order to enable multi-dimensional simulations with basic spectral radiative transfer when the available computational resources are not sufficient to solve the complete Boltzmann transport equation. The distribution function of the transported particle...
متن کاملDerivation of the Isotropic Diffusion Source Approximation (IDSA) for Supernova Neutrino Transport by Asymptotic Expansions
We present Chapman–Enskog and Hilbert expansions applied to the O(v/c) Boltzmann equation for the radiative transfer of neutrinos in core-collapse supernovae. Based on the Legendre expansion of the scattering kernel for the collision integral truncated after the second term, we derive the diffusion limit for the Boltzmann equation by truncation of Chapman–Enskog or Hilbert expansions with react...
متن کاملSupernova Neutrinos and a New Algorithm for Neutrino Transport
We have developed a new implicit, multi–group, time–dependent, spherical neutrino transport algorithm based on the Feautrier variables, the tangent–ray method, and accelerated Λ iteration. The code achieves high angular resolution, is conceptually equivalent to a Boltzmann solver (without redshifts), and solves the transport equation exactly at all optical depths. We summarize and review the ne...
متن کاملA New Algorithm for Supernova Neutrino Transport and Some Applications
We have developed an implicit, multi–group, time–dependent, spherical neutrino transport code based on the Feautrier variables, the tangent–ray method, and accelerated Λ iteration. The code achieves high angular resolution, is good to O(v/c), is equivalent to a Boltzmann solver (without gravitational redshifts), and solves the transport equation at all optical depths with precision. In this pap...
متن کاملSupernova Simulations with Boltzmann Neutrino Transport: a Comparison of Methods
Accurate neutrino transport has been built into spherically symmetric simulations of stellar core collapse and postbounce evolution. The results of such simulations agree that spherically symmetric models with standard microphysical input fail to explode by the delayed, neutrino-driven mechanism. Independent groups implemented fundamentally different numerical methods to tackle the Boltzmann ne...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2009
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/698/2/1174