论文标题
3D光子保存代码，用于时期的一般相对论辐射转移：卡通
3D Photon Conserving Code for Time-dependent General Relativistic Radiative Transfer : CARTOON
论文作者
论文摘要
我们开发了三维一般相对论辐射转移代码：卡通（根据曲面时空中的光子数量保护的真实辐射传输的计算代码），这是从二维代码中改进的：Takahashi＆Umemura（2017）开发的艺术家。在卡通中，以光子数支持方式求解了频率积分的一般相对论辐射传递方程，并在零角动量观察者（ZAMO）框架中的各向同性和相干散射和流体休息框架结合了。通过计算光子的平均能量，还可以保证辐射的能量保存。通过在二维和三维空间中的测试计算，我们已经证明了黑洞时空中的波前传播可以在卡通保存光子数量中正确解决。波前的位置与分析溶液一致，并且光子的数量保持恒定，直到波前到达事件范围。我们还求解了到达观察者屏幕的大地测量上的辐射传递方程。观察者屏幕上强度图的时间变化可以同时且一致地与黑洞周围的辐射场的时间变化计算。此外，黑洞阴影可以在适度的光学薄情况下复制。
We develop the 3-dimensional general relativistic radiative transfer code: CARTOON (Calculation code of Authentic Radiative Transfer based On phOton Number conservation in curved space-time) which is improved from the 2-dimensional code: ARTIST developed by Takahashi & Umemura (2017). In CARTOON, the frequency-integrated general relativistic radiative transfer equation is solved in a photon number-conserving manner, and the isotropic and coherent scattering in the zero angular momentum observers (ZAMO) frame and the fluid rest frame is incorporated. By calculating the average energy of photons, energy conservation of the radiation is also guaranteed. With the test calculations in 2-dimensional and 3-dimensional space, we have demonstrated that the wavefront propagation in black hole space-time can be correctly solved in CARTOON conserving photon numbers. The position of the wavefront coincides with the analytical solution and the number of photons remains constant until the wavefront reaches the event horizon. We also solve the radiative transfer equation on the geodesic reaching the observer's screen. The time variation of the intensity map on the observer's screen can be simultaneously and consistently calculated with the time variation of the radiation field around the black hole. In addition, the black hole shadow can be reproduced in moderately optically thin situations.
