论文标题
通过改进的真空处理，提高二进制中子星模拟的准确性
Increasing the Accuracy of Binary Neutron Star Simulations with an improved Vacuum Treatment
论文作者
论文摘要
数值相对性模拟对于研究二进制中子星聚结的最后阶段至关重要。不幸的是，对于稳定的模拟，需要增加人造的低密度气氛。在这里，我们讨论了一个新的框架，在该框架中，我们可以有效地将中子星周围的密度设置为零，以确保更准确的模拟。我们使用许多单星测试用例和相等的质量二进制中子星模拟测试我们的方法。尽管系统的批量运动不受影响，因此，对于发射的重力波信号没有改善，但我们发现，对于质量保护，新方法是优越的，并且可以更好地跟踪向外移动材料。这将允许对弹出材料进行更准确的模拟，并支持对当前和未来的多理智观察值的解释，并具有更准确的数值相对性模拟。
Numerical relativity simulations are essential to study the last stages of the binary neutron star coalescence. Unfortunately, for stable simulations there is the need to add an artificial low-density atmosphere. Here we discuss a new framework in which we can effectively set the density surrounding the neutron stars to zero to ensure a more accurate simulation. We test our method with a number of single star test cases and for an equal mass binary neutron star simulation. While the bulk motion of the system is not influenced, and hence, there is no improvement with respect to the emitted gravitational-wave signal, we find that the new approach is superior with respect to mass conservation and it allows a much better tracking of outward moving material. This will allow a more accurate simulation of the ejected material and supports the interpretation of present and future multi-messenger observations with more accurate numerical relativity simulations.
