Tetrahedron constellation of gravitational wave observatory

IF 6.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Hong-Bo Jin, Cong-Feng Qiao
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Abstract

For the first time, we have introduced the tetrahedron constellation of gravitational wave observatory (TEGO) composed of four identical spacecrafts (S/Cs). The laser telescopes and their pointing structures are mounted on the S/C platform and are evenly distributed at three locations 120 degrees apart. These structures form automatically a stable mass center for the platform. The time delay interferometry (TDI) is used to suppress the frequency noise of gravitational wave (GW) detector. The unequal-arm Michelson TDI configuration and the Sagnac TDI configuration are equally effective at eliminating the laser frequency noise based on the TEGO configuration. Furthermore, compared with the configurations of LISA, Taiji, and TianQin, the TEGO has more combinations of optical paths in its TDI system sensitive to GW signals. The six arms of TEGO are simultaneously sensitive to the six polarization modes of GWs. The sensitivity implies that GW modes beyond the predictions of general relativity (GR) can be detected directly. For instance, a scalar longitudinal mode of GWs, which is not predicted by GR, has been identified as a dominant polarization component. This mode is found to be evident in the response amplitudes of the TEGO arms, such as between S/C1 and S/C4, and S/C3 and S/C4, at certain orbital positions.

引力波观测站的四面体星座
我们首次介绍了由四个相同航天器(S/Cs)组成的四面体星座引力波观测站(TEGO)。激光望远镜及其指向结构安装在 S/C 平台上,并均匀分布在相距 120 度的三个位置。这些结构自动形成平台的稳定质量中心。时延干涉测量(TDI)用于抑制引力波(GW)探测器的频率噪声。在 TEGO 配置的基础上,不等臂迈克尔逊 TDI 配置和萨格纳克 TDI 配置在消除激光频率噪声方面同样有效。此外,与 LISA、Taiji 和 TianQin 的配置相比,TEGO 的 TDI 系统中对 GW 信号敏感的光路组合更多。TEGO 的六个臂同时对 GW 的六种偏振模式敏感。这种灵敏度意味着可以直接探测到广义相对论(GR)预测之外的 GW 模式。例如,GWs 的一种标量纵向模式被确定为一个主要的偏振成分,而这一模式是 GR 预测之外的。在某些轨道位置上,这种模式在 TEGO 观测臂的响应振幅中非常明显,例如在 S/C1 和 S/C4 之间,以及 S/C3 和 S/C4 之间。
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来源期刊
Science China Physics, Mechanics & Astronomy
Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-
CiteScore
10.30
自引率
6.20%
发文量
4047
审稿时长
3 months
期刊介绍: Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.
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