标题： 能量依赖和能量积分的两矩量广义相对论中微子输运模拟的超大质量中子星 显示英文标题

标题： Energy-dependent and energy-integrated two-moment general-relativistic neutrino transport simulations of hypermassive neutron star

摘要： 我们比较了基于两矩的\emph{能量依赖的}和三种\emph{能量积分}中微子输运的广义相对论磁流体动力学模拟，这些模拟是针对超大质量中子星的。 为了研究中微子输运方案选择的影响，我们使用相同的设置和输入中微子微观物理进行了模拟。 我们发现能量依赖和能量积分中微子输运之间的主要差异体现在盘和抛射物的特性以及中微子信号上。 在能量依赖输运中，围绕中子星的盘和抛射物的特性与使用能量积分方案得到的结果非常不同。 具体来说，在能量依赖的情况下，盘在早期时间更富含中子，在后期时间则更加几何上厚。 此外，抛射物的质量更大，并且在能量依赖模拟中平均更富含中子。 而且，平均中微子能量和光度大约高出 30%。 如果希望通过数值模拟更好地模拟中子星合并残余物的中微子信号和物质外流，则需要进行能量依赖的中微子输运。 显示英文摘要

摘要： We compare two-moment based \emph{energy-dependent} and 3 variants of \emph{energy-integrated} neutrino transport general-relativistic magnetohydrodynamics simulations of hypermassive neutron star. To study the impacts due to the choice of the neutrino transport schemes, we perform simulations with the same setups and input neutrino microphysics. We show that the main differences between energy-dependent and energy-integrated neutrino transport are found in the disk and ejecta properties, as well as in the neutrino signals. The properties of the disk surrounding the neutron star and the ejecta in energy-dependent transport are very different from the ones obtained using energy-integrated schemes. Specifically, in the energy-dependent case, the disk is more neutron-rich at early times, and becomes geometrically thicker at later times. In addition, the ejecta is more massive, and on average more neutron-rich in the energy-dependent simulations. Moreover, the average neutrino energies and luminosities are about 30\% higher. Energy-dependent neutrino transport is necessary if one wants to better model the neutrino signals and matter outflows from neutron star merger remnants via numerical simulations.