Modeling dynamical scalarization with a resummed post-Newtonian expansion
Modeling dynamical scalarization with a resummed post-Newtonian expansion
复制标题
通过恢复后牛顿展开式对动态标量化进行建模
DOI：
10.1103/physrevd.93.124004
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发表时间：
2016
影响因子：
5
通讯作者：
A. Buonanno
中科院分区：
文献类型：
--
作者：
N. Sennett;A. Buonanno
尽管天体物理观测设置了严格的限制，但仍然存在可行的标量张量理论，可以与带有引力波探测器的广义相对论区分开来。在这些替代理论中预测的一个有希望的信号是动力学标度化，它可以极大地影响中子星双星合并附近的演化。受自发标量化的成功处理的启发，我们发展了一种形式主义，它部分地恢复了后牛顿展开，以数学上一致的方式捕捉动态标量化。我们计算了双星系统运动方程和标量质量的后牛顿有序修正。通过与准平衡组态计算的比较，我们验证了这种新的近似方案能够准确地预测动力学标度化的开始和大小。
Despite stringent constraints set by astrophysical observations, there remain viable scalar-tensor theories that could be distinguished from general relativity with gravitational-wave detectors. A promising signal predicted in these alternative theories is dynamical scalarization, which can dramatically affect the evolution of neutron-star binaries near merger. Motivated by the successful treatment of spontaneous scalarization, we develop a formalism that partially resums the post-Newtonian expansion to capture dynamical scalarization in a mathematically consistent manner. We calculate the post-Newtonian order corrections to the equations of motion and scalar mass of a binary system. Through comparison with quasi-equilibrium configuration calculations, we verify that this new approximation scheme can accurately predict the onset and magnitude of dynamical scalarization.