Parametrized test of parity-violating gravity using GWTC-1 events
Parametrized test of parity-violating gravity using GWTC-1 events
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DOI：
10.1093/ptep/ptaa103
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
Kei Yamada;Takahiro Tanaka
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文献类型：
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作者：
Kei Yamada;Takahiro Tanaka
违反宇称（PV）的引力最近在几个方面引起了人们的兴趣。其中之一是轴子-引力子耦合，用于测试轴子-暗物质模型。此外，通过将Chern-Simons （CS）引力扩展到包含标量场的二阶导数，我们提出了一类更一般的PV引力理论，我们称之为CNCL模型。Crisostomi {\it et al.}，物理学。参考文献D， {\bf 97}, 044034(2018)]。该模型可以通过包含更高的标量场导数和/或更高的曲率项来进一步扩展。本文通过引入一个与模型无关的修正参数化，讨论了引力扇区宇称违和对二元合并引力波传播的影响。我们的参数化包括CNCL模型和CS重力。宇称违反对引力波形的影响在源双星朝向我们视线的边缘上最大，而修正后的波形在源朝向我们视线的方向上减小到宇称对称。我们利用LIGO/Virgo O1/O2星表对这种改变的特征进行了搜索。我们发现星表数据符合广义相对论，并首次获得了各种后牛顿阶修正的引力宇称违反约束。所得的CS重力约束与前人的研究结果一致。另一方面，我们获得的CNCL模型的约束比以前的结果严格了大约7个数量级。
Parity-violating (PV) gravity has recently attracted interest in several aspects. One of them is the axion-graviton coupling to test the axion-dark matter model. Moreover, by extending Chern-Simons (CS) gravity to include derivatives of a scalar field up to the second order, a more general class of PV gravity theory, which we call the CNCL model, has been proposed~[M. Crisostomi {\it et al.}, Phys. Rev. D, {\bf 97}, 044034 (2018)]. The model can be further extended by including even higher derivatives of the scalar field and/or higher curvature terms. In this paper, we discuss the effect of parity violation in the gravitational sector on the propagation of gravitational waves from binary coalescence by introducing a model-independent parametrization of modification. Our parametrization includes the CNCL model as well as CS gravity. The effect of parity violation on the gravitational waveform is maximum when the source binary orientation to our line of sight is edge-on, while the modified waveform reduces to the parity-symmetric one when the source is face-on. We perform a search for the signature of such modification by using the LIGO/Virgo O1/O2 catalog. We find that the catalog data is consistent with general relativity and obtain constraints on parity violation in gravity for various post-Newtonian order modifications for the first time. The obtained constraint on CS gravity is consistent with the results in previous works. On the other hand, the constraint on the CNCL model that we obtain is tighter than the previous results by roughly 7 orders of magnitude.