Search for scalar-tensor mixed polarization modes of gravitational waves
Search for scalar-tensor mixed polarization modes of gravitational waves
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DOI：
10.1103/physrevd.105.084019
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发表时间：
2021-05
影响因子：
5
通讯作者：
H. Takeda;S. Morisaki;A. Nishizawa
中科院分区：
文献类型：
--
作者：
H. Takeda;S. Morisaki;A. Nishizawa
引力波的额外标量自由度通常在广义相对论之外的引力理论中被预测，并可用于引力的模型不可知测试。在这封公开信中，我们报告了通过分析GW170814和GW170817（分别是双黑洞和双中子星的合并事件）的数据，首次直接搜索到强引力下致密双星引力波的标量-张量混合偏振模式。因此，我们得到了标量模态振幅与张量模态振幅之比的约束条件：GW170814为$\lesssim 0.18$， GW170817为$\lesssim 0.069$，这是迄今为止在强引力域中得到的关于标量极化存在的最强约束条件。
An additional scalar degree of freedom for a gravitational wave is often predicted in theories of gravity beyond general relativity and can be used for a model-agnostic test of gravity. In this letter, we report the first direct search for the scalar-tensor mixed polarization modes of gravitational waves from compact binaries in a strong regime of gravity by analyzing the data of GW170814 and GW170817, which are the merger events of binary black holes and binary neutron stars, respectively. Consequently, we obtain the constraints on the ratio of scalar-mode amplitude to tensor-mode amplitude: $\lesssim 0.18$ for GW170814 and $\lesssim 0.069$ for GW170817, which are the strongest constraints obtained so far on the presence of the scalar polarization in a strong regime of gravity.