Chimera: A Massively Parallel Code for Core-collapse Supernova Simulations
Chimera: A Massively Parallel Code for Core-collapse Supernova Simulations
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DOI：
10.3847/1538-4365/ab7aff
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发表时间：
2018-09
期刊：
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通讯作者：
S. Bruenn;J. Blondin;W. Hix;E. Lentz;O. E. Bronson Messer;A. Mezzacappa;E. Endeve;J. A. Harris;P. Marronetti;R. Budiardja;M. A. Chertkow;Ching-Tsai Lee
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作者：
S. Bruenn;J. Blondin;W. Hix;E. Lentz;O. E. Bronson Messer;A. Mezzacappa;E. Endeve;J. A. Harris;P. Marronetti;R. Budiardja;M. A. Chertkow;Ching-Tsai Lee
我们提供了一个详细的描述嵌合体代码，代码开发的核心坍缩超新星（CCSNe）在多个空间维度的模型。CCSN的爆炸机制仍然是深入研究的主题。迄今为止的进展表明，它涉及到中微子的产生，运输和相互作用在恒星核心，三维恒星核心流体动力学及其相关的不稳定性，核燃烧，中微子-恒星核心弱相互作用的基本物理和所有恒星核心成分的状态方程，特别是与核心核子相关的核状态方程，在核中既有游离的也有结合的。嵌合体，通过结合详细的中微子输运，现实的中微子-物质相互作用，三维流体力学，现实的核，轻子和光子状态方程，核反应网络，沿着其他改进，可以用来研究中微子辐射，流体动力学不稳定性，以及各种输入物理在爆炸机制本身的作用。它也可以用来计算可观测量，如中微子签名，引力辐射，以及与CCSNe相关的核合成产物。该代码包含中微子输运，多维可压缩流体力学，核反应，各种中微子相互作用，状态方程和模块，以提供数据的后处理观测，如核合成的产品，和引力辐射的模块。Chimera是一个不断发展的代码，定期更新，改进输入物理和数值优化。我们在这里详细介绍了代码的当前版本，未来的改进将源于此，而这些改进又可以在未来的出版物中根据需要进行描述。
We provide a detailed description of the Chimera code, a code developed to model core collapse supernovae (CCSNe) in multiple spatial dimensions. The CCSN explosion mechanism remains the subject of intense research. Progress to date demonstrates that it involves a complex interplay of neutrino production, transport, and interaction in the stellar core, three-dimensional stellar core fluid dynamics and its associated instabilities, nuclear burning, and the fundamental physics of the neutrino–stellar core weak interactions and the equations of state of all stellar core constituents—particularly, the nuclear equation of state associated with core nucleons, both free and bound in nuclei. Chimera, by incorporating detailed neutrino transport, realistic neutrino–matter interactions, three-dimensional hydrodynamics, realistic nuclear, leptonic, and photonic equations of state, and a nuclear reaction network, along with other refinements, can be used to study the role of neutrino radiation, hydrodynamic instabilities, and a variety of input physics in the explosion mechanism itself. It can also be used to compute observables such as neutrino signatures, gravitational radiation, and the products of nucleosynthesis associated with CCSNe. The code contains modules for neutrino transport, multidimensional compressible hydrodynamics, nuclear reactions, a variety of neutrino interactions, equations of state, and modules to provide data for post-processing observables such as the products of nucleosynthesis, and gravitational radiation. Chimera is an evolving code, being updated periodically with improved input physics and numerical refinements. We detail here the current version of the code, from which future improvements will stem, which can in turn be described as needed in future publications.