We here present a new version of the publicly available general relativistic magnetohydrodynamic (GRMHD) code Spritz, which now includes an approximate neutrino leakage scheme able to handle neutrino cooling and heating. The leakage scheme is based on the publicly available ZelmaniLeak code, with a few modifications in order to properly work with Spritz. We discuss the involved equations, physical assumptions, and implemented numerical methods, along with a large battery of general relativistic tests performed with and without magnetic fields. Our tests demonstrate the correct implementation of the neutrino leakage scheme, paving the way for further improvements of our neutrino treatment and the first application to magnetized binary neutron star mergers. We also discuss the implementation in the Spritz code of high-order methods for a more accurate evolution of hydrodynamical quantities.

我们在此展示了公开可用的广义相对论磁流体动力学 (GRMHD) 代码Spritz的新版本，该代码现在包括能够处理中微子冷却和加热的近似中微子泄漏方案。泄漏方案基于公开可用的ZelmaniLeak代码，为了与Spritz正常工作，进行了一些修改. 我们讨论了所涉及的方程、物理假设和实现的数值方法，以及在有和没有磁场的情况下进行的大量一般相对论测试。我们的测试证明了中微子泄漏方案的正确实施，为我们的中微子处理的进一步改进和磁化双中子星合并的首次应用铺平了道路。我们还讨论了高阶方法在Spritz代码中的实现，以便更准确地演化流体力学量。