Odyssey：Kerr时空中广义相对论辐射转移的GPU程序
Odyssey: A Public GPU-Based Code for General-Relativistic Radiative Transfer in Kerr Spacetime
摘要：
广义相对论辐射转移（GRRT）计算与Kerr时空中测地线的计算相结合，是确定黑洞附近物质的图像、光谱和光变曲线的重要工具。这些研究对于正在进行和即将进行的毫米/亚毫米（mm/sub-mm）甚长基线干涉测量（VLBI）观测Sgr A^{*}和M87中心的超大质量黑洞尤为重要。为此，我们介绍奥德赛，一个图形处理单元（GPU）为基础的代码的光线跟踪和辐射转移的克尔时空。在单个GPU上，Odyssey的性能可以超过每个光子1纳秒，每个Runge-Kutta积分步骤。Odyssey是公开可用的，快速，准确，灵活，足以进行修改，以适应新用户的特定需求。随着一个图形用户界面（GUI）的视频加速显示架构，我们还提出了一个教育软件工具，奥德赛_Edu，显示在实时如何零测地线围绕克尔黑洞变化的函数的黑洞自旋和入射角到黑洞。
英文摘要：
General-relativistic radiative transfer (GRRT) calculations coupled with the calculation of geodesics in the Kerr spacetime are an essential tool for determining the images, spectra and light curves from matter in the vicinity of black holes. Such studies are especially important for ongoing and upcoming millimeter/submillimeter (mm/sub-mm) Very Long Baseline Interferometry (VLBI) observations of the supermassive black holes at the centres of Sgr A^{*} and M87. To this end we introduce Odyssey, a Graphics Processing Unit(GPU)-based code for ray tracing and radiative transfer in the Kerr spacetime. On a single GPU, the performance of Odyssey can exceed 1 nanosecond per photon, per Runge-Kutta integration step. Odyssey is publicly available, fast, accurate, and flexible enough to be modified to suit the specific needs of new users. Along with a Graphical User Interface (GUI) powered by a video-accelerated display architecture, we also present an educational software tool, Odyssey_Edu, for showing in real time how null geodesics around a Kerr black hole vary as a function of black hole spin and angle of incidence onto the black hole.
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