Collaborative Research: Toward 3-dimensional, time-dependent, non-LTE radiation transport for cosmological simulations

该小组将开发一种新的数值方案，用于跟踪星系内部和周围气体的辐射转移。他们将联合收割机的方法，已成功地在恒星大气层的问题，自适应网格细化代码ENZO是适应宇宙学模拟。ENZO已提供给社区使用。与以往的辐射输运求解器，这个新的计划将处理散射准确地使用加速λ迭代与短特征方法。非LTE效应（与局部热力学平衡近似不一致）在莱曼α光子的传输将被包括在内。辐射将耦合到流体力学使用运营商分裂的方法。该代码将用于模拟宇宙历史早期星系之间气体的物理状态，因为它被原始恒星和星系的活动核电离。所有三名团队成员将与研究生一起进行这项研究。ENZO代码是公开的，新的运输求解器将向科学界发布。

This team will develop a new numerical scheme for following the transfer of radiation through the gas within and around galaxies. They will combine methods that have worked successfully in problems of stellar atmospheres with the adaptive mesh refinement code ENZO that is adapted for cosmological simulations. ENZO has been made available for community use. Unlike previous radiation-transport solvers, this new scheme will treat scattering exactly using accelerated Lambda iteration with the short characteristic method. Non-LTE effects (those inconsistent with the approximation of local thermodynamic equilibrium) in the transport of Lyman-alpha photons will be included. Radiation will be coupled to hydrodynamics using an operator-split approach. The code would be used to model the physical state of the gas between the galaxies early is cosmic history, as it is ionized by primeval stars, and by the active nuclei of galaxies. All three of the team members will work with graduate students on this research. The ENZO code is public, and the new transport solver will be released to the scientific community.