论文标题
用双白色矮人约束重力波的额外极化模式
Constraining the Extra Polarization Modes of Gravitational Waves with Double White Dwarfs
论文作者
论文摘要
重力波（GW）的检测已打开一个新的窗口，以测试强场状态中的重力理论。在一般相对论（GR）中，GW只能拥有两种张量化极化模式，这些模式称为$+$和$ \ times $模式。但是，矢量和标量模式可以存在于一些经过修改的重力理论中，我们可以通过探测这些额外的极化模式来测试重力理论。作为一个太空GW探测器，天气将于2030年代推出，预计将观察到大量的GW信号，包括我们银河系中近十万双白矮人（DWD）的信号。这为测试额外的极化模式的存在提供了绝佳的机会。在本文中，我们分析了使用DWD检测额外极化模式的能力。对于额外的模式，我们同时考虑了领先的偶极子辐射和转向的四极辐射。我们发现天气的能力对源方向具有非常强烈的依赖性。我们还分析了具有确定位置和频率的所有验证二进制文件，并发现ZTF J1539可以对额外的极化模式给予最佳约束。我们还考虑了天气双胞胎星座的情况，以及与丽莎的联合观察。
The detection of gravitational wave (GW) has opened a new window to test the theory of gravity in the strong field regime. In general relativity (GR), GW can only possess two tensor polarization modes, which are known as the $+$ and $\times$ modes. However, vector and scalar modes can exist in some modified theories of gravity, and we can test the gravitational theories by probing these extra polarization modes. As a space-borne GW detector, TianQin will be launched in the 2030s, and it is expected to observe plenty of GW signals, including those from nearly ten-thousands double white dwarfs (DWDs) in our galaxy. This offers an excellent chance for testing the existence of extra polarization modes. In this article, we analyze the capability of detecting the extra polarization modes with DWDs. For the extra modes, we consider both the leading order dipole radiation and the subleading quadrupole radiation. We find that the capability of TianQin has very strong dependency on the source orientation. We also analyze all the verification binaries with determined position and frequency, and find that ZTF J1539 can give the best constraint on the extra polarization modes. We have also considered the case of TianQin twin constellation, and the joint observation with LISA.
