论文标题
GW170814和GW170817的纯极化测试使用与重力理论一致的波形
Pure polarization test of GW170814 and GW170817 using waveforms consistent with modified theories of gravity
论文作者
论文摘要
重力波（GW）的物理自由度是重力性质的烙印。我们可以通过搜索超出一般相对性的极化模式来测试重力理论。 Ligo-Virgo协作分析了O1和O2中的几个GW事件观察到纯极化框架中的运行，在那里他们在一般相对论和仅允许标量或矢量极化模式的理论之间执行贝叶斯模型选择。在本文中，我们将GW170814（二进制黑洞合并）和GW170817（二进制中子星合并）的极化重新分析在改进的纯极化框架中，包括非义学辐射的角度模式。我们发现GW170814的贝叶斯因子的对数为2.775和3.636，有利于纯张量极化对纯矢量和标量极化。这些贝叶斯因子与Ligo-Virgo协作的先前结果一致，尽管二进制文件的估计参数显着偏见。对于GW170817，先验在NGC4993的二进制位置上，我们发现贝叶斯因子的对数为21.078和44.544，分别对纯张量极化对纯矢量和标量极化。与标量极化相比，这些比与标量极化相比，这些比与标量偏振相比更强烈地支持GR。此外，通过利用来自伽马射线爆发射流的二进制的方向信息，我们发现贝叶斯因子的对数为51.043和60.271，有利于对纯矢量和纯标量极化的纯张量极化，从没有射流的纯度量表上得到了巨大改进。
The physical degrees of freedom of a gravitational wave (GW) are imprints of the nature of gravity. We can test a gravity theory by searching for polarization modes beyond general relativity. The LIGO-Virgo collaboration analyzed several GW events in the O1 and O2 observing runs in the pure polarization framework, where they perform the Bayesian model selection between general relativity and the theory allowing only scalar or vector polarization modes. In this paper, we reanalyze the polarizations of GW170814 (binary black hole merger) and GW170817 (binary neutron star merger) in the improved framework of pure polarizations including the angular patterns of nontensorial radiation. We find logarithms of the Bayes factors of 2.775 and 3.636 for GW170814 in favor of the pure tensor polarization against pure vector and scalar polarizations, respectively. These Bayes factors are consistent with the previous results by the LIGO-Virgo collaboration, though the estimated parameters of the binaries are significantly biased. For GW170817 with the priors on the location of the binary from NGC4993, we find logarithms of the Bayes factors of 21.078 and 44.544 in favor of the pure tensor polarization against pure vector and scalar polarizations, respectively. These more strongly support GR, epecially compared to the scalar polarization, than the previous results by the LIGO-Virgo collaboration due to the location prior. In addition, by utilizing the orientation information of the binary from a gamma-ray burst jet, we find logarithms of the Bayes factor of 51.043 and 60.271 in favor of the pure tensor polarization against pure vector and pure scalar polarization, much improved from those without the jet prior.
