利用波导中的电磁波极化探测甚高频残余引力波
Detecting very-high-frequency relic gravitational waves by electromagnetic wave polarizations in a waveguide
摘要：
在受引力波扰动的时空区域中，电磁波（EW）的极化矢量（PV）会发生旋转。基于这个想法，Cruise的团队已经建立了一个环形波导来检测GW。详细计算了不同方向、不同偏振态的波导对电子战偏振矢量的旋转，并分析了电子战沿环形波导经过n个周期后对偏振矢量的累积效应。我们重新检查的可行性和局限性，这种方法来检测周围的100 MHz的高频引力波，特别是遗迹引力波（RGW）。通过比较加速宇宙中RGW的光谱与当前波导探测器的灵敏度，发现RGW的幅度太低，无法被当前运行的波导探测器探测到。最后讨论了提高检测性能的可能途径。
英文摘要：
The polarization vector (PV) of an electromagnetic wave (EW) will experience a rotation in a region of spacetime perturbed by gravitational waves (GWs). Based on this idea, Cruise's group has built an annular waveguide to detect GWs. We give detailed calculations of the rotations of the polarization vector of an EW caused by incident GWs from various directions and in various polarization states, and then analyze the accumulative effects on the polarization vector when the EW passes n cycles along the annular waveguide. We reexamine the feasibility and limitation of this method to detect GWs of high frequency around 100 MHz, in particular, the relic gravitational waves (RGWs). By comparing the spectrum of RGWs in the accelerating universe with the detector sensitivity of the current waveguide, it is found that the amplitude of the RGWs is too low to be detected by the waveguide detectors currently running. Possible ways of improvements on detection are discussed also.
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