论文标题
量化一般相对论的磁性水力动力代码中的不确定性
Quantifying uncertainties in general relativistic magnetohydrodynamic codes
论文作者
论文摘要
在本文中，我们表明，类似的一般相对论磁流失动力学（GRMHD）的开源代码为二元中性星星合并的关键特征产生不同的结果。首先，我们提出了一个新的开源版本的伊利诺伊斯格里MHD代码，该版本为现实，有限的状态方程提供了支持。在对我们升级的代码进行了严格的测试之后，我们在Grhydro，Illinoisgrmhd，Spritz和Whiskythc之间进行了代码比较，该代码实现了相同的物理学，但计算方法略有不同。比较的好处是，所有代码都嵌入了Einsteintoolkit套件中，因此它们的唯一区别是算法。我们发现相似的收敛性能，流体动力学和引力波，但合并时间，残余寿命和重力波阶段不同。在以这种模拟模拟的合并后动力学可以可靠地推断核物质的性质之前，尤其是在精确的引力波天文学时代，必须解决此类差异。
In this paper, we show that similar open-source codes for general relativistic magnetohydrodynamic (GRMHD) produce different results for key features of binary neutron star mergers. First, we present a new open-source version of the publicly available IllinoisGRMHD code that provides support for realistic, finite temperature equations of state. After stringent tests of our upgraded code, we perform a code comparison between GRHydro, IllinoisGRMHD, Spritz, and WhiskyTHC, which implement the same physics, but slightly different computational methods. The benefit of the comparison is that all codes are embedded in the EinsteinToolkit suite, hence their only difference is algorithmic. We find similar convergence properties, fluid dynamics, and gravitational waves, but different merger times, remnant lifetimes, and gravitational wave phases. Such differences must be resolved before the post-merger dynamics modeled with such simulations can be reliably used to infer the properties of nuclear matter especially in the era of precision gravitational wave astronomy.
