AN OPEN-SOURCE NEUTRINO RADIATION HYDRODYNAMICS CODE FOR CORE-COLLAPSE SUPERNOVAE
AN OPEN-SOURCE NEUTRINO RADIATION HYDRODYNAMICS CODE FOR CORE-COLLAPSE SUPERNOVAE
复制标题
核心塌陷超新星的开源中微子辐射流体动力学代码
DOI：
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发表时间：
2014
期刊：
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通讯作者：
E. O’Connor
中科院分区：
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作者：
E. O’Connor
我们提出了一个开源更新球对称，广义相对论流体力学，核心坍缩超新星（CCSN）代码GR1D。源代码可从http://www.GR1Dcode.org获得。我们扩展了它的功能，包括基于Shibata等人和Cardall等人的矩形式的中微子输运的广义相对论处理。我们特别注意实现和测试数值方法和近似值，这些方法和近似值通过消除反转大矩阵的需要来减少传输方案的计算需求。这对于二维和三维的类矩传输方法的实现和发展尤其重要。中微子输运计算的一个关键组成部分是描述中微子产生、吸收、散射和湮灭的中微子-物质相互作用系数。在本文中，我们还描述了我们的开源中微子交互库NuLib（可从http://www.nulib.org获得）。我们认为，描述这些相互作用的开源方法是实现CCSNe稳健模型和中微子信号稳健预测所需的主要步骤之一。通过与CCSNe的完整玻尔兹曼中微子输运模拟的比较，我们的中微子输运代码表现得非常好。此外，我们还表明，我们用来提高效率的方法和近似并不会降低结果的保真度。我们还测试了我们的广义相对论输运代码模拟失败的CCSNe的能力，方法是将一个40倍太阳质量的前身演化为坍缩成黑洞的开始。
We present an open-source update to the spherically symmetric, general-relativistic hydrodynamics, core-collapse supernova (CCSN) code GR1D. The source code is available at http://www.GR1Dcode.org. We extend its capabilities to include a general-relativistic treatment of neutrino transport based on the moment formalisms of Shibata et al. and Cardall et al. We pay special attention to implementing and testing numerical methods and approximations that lessen the computational demand of the transport scheme by removing the need to invert large matrices. This is especially important for the implementation and development of moment-like transport methods in two and three dimensions. A critical component of neutrino transport calculations is the neutrino–matter interaction coefficients that describe the production, absorption, scattering, and annihilation of neutrinos. In this article we also describe our open-source neutrino interaction library NuLib (available at http://www.nulib.org). We believe that an open-source approach to describing these interactions is one of the major steps needed to progress toward robust models of CCSNe and robust predictions of the neutrino signal. We show, via comparisons to full Boltzmann neutrino-transport simulations of CCSNe, that our neutrino transport code performs remarkably well. Furthermore, we show that the methods and approximations we employ to increase efficiency do not decrease the fidelity of our results. We also test the ability of our general-relativistic transport code to model failed CCSNe by evolving a 40-solar-mass progenitor to the onset of collapse to a black hole.