A NEW MONTE CARLO METHOD FOR TIME-DEPENDENT NEUTRINO RADIATION TRANSPORT
A NEW MONTE CARLO METHOD FOR TIME-DEPENDENT NEUTRINO RADIATION TRANSPORT
复制标题
时变中微子辐射输运的新蒙特卡罗方法
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
E. Schnetter
中科院分区：
文献类型：
--
作者：
E. Abdikamalov;A. Burrows;C. Ott;F. Löffler;E. O’Connor;J. Dolence;E. Schnetter
蒙特卡罗辐射输运方法有几个吸引人的特性，如实现简单、精度高和良好的并行缩放。此外，蒙特卡罗方法可以处理复杂的几何形状，并且相对容易扩展到多个空间维度，这使得它们在模拟复杂的多维天体物理现象（如核心坍缩超新星）方面具有潜在的兴趣。本文的目的是探索用蒙特卡罗方法模拟核心坍缩超新星中的中微子输运。我们将Fleck & Cummings的隐式蒙特卡罗光子输运方案和Densmore等人的灰色离散扩散方案推广到与能量、时间和速度相关的中微子输运。使用我们的一维球对称实现，我们表明，与光子输运情况类似，隐式方案与显式时间离散相比可以实现更大的时间步长，而不会牺牲精度，而离散扩散方法在高光学深度下可以显着加速。我们的研究结果表明，光谱、速度相关、隐式蒙特卡罗和离散扩散蒙特卡罗方法的组合代表了一种用于核心坍缩超新星中中微子输运计算的稳健方法。我们的速度相关方案可以很容易地适用于光子传输。
Monte Carlo approaches to radiation transport have several attractive properties such as simplicity of implementation, high accuracy, and good parallel scaling. Moreover, Monte Carlo methods can handle complicated geometries and are relatively easy to extend to multiple spatial dimensions, which makes them potentially interesting in modeling complex multi-dimensional astrophysical phenomena such as core-collapse supernovae. The aim of this paper is to explore Monte Carlo methods for modeling neutrino transport in core-collapse supernovae. We generalize the Implicit Monte Carlo photon transport scheme of Fleck & Cummings and gray discrete-diffusion scheme of Densmore et al. to energy-, time-, and velocity-dependent neutrino transport. Using our 1D spherically-symmetric implementation, we show that, similar to the photon transport case, the implicit scheme enables significantly larger timesteps compared with explicit time discretization, without sacrificing accuracy, while the discrete-diffusion method leads to significant speed-ups at high optical depth. Our results suggest that a combination of spectral, velocity-dependent, Implicit Monte Carlo and discrete-diffusion Monte Carlo methods represents a robust approach for use in neutrino transport calculations in core-collapse supernovae. Our velocity-dependent scheme can easily be adapted to photon transport.
DOI：
10.1088/0004-637x/694/1/664
发表时间：
2007-08
期刊：
The Astrophysical Journal
影响因子：
--
作者：
A. Marek;H. Janka
通讯作者：
A. Marek;H. Janka