局域体流的极化特征
The Polarization Signature of Local Bulk Flows
摘要：
星系际介质的大的特殊速度产生了具有频率依赖的四极项的宇宙微波背景多普勒频移。这个四极将作为宇宙微波背景的极化源，如果大规模的整体流动是局部的和相干的，就会产生大规模的极化各向异性。在我们接近运动区域中心的情况下，极化信号是纯四极。我们表明，信号是小的，但检测与未来的实验散装流量大，最近的一些报告。
英文摘要：
A large peculiar velocity of the intergalactic medium produces a Doppler shift of the cosmic microwave background with a frequency-dependent quadrupole term. This quadrupole will act as a source for polarization of the cosmic microwave background, creating a large-scale polarization anisotropy if the bulk flow is local and coherent on large scales. In the case where we are near the center of the moving region, the polarization signal is a pure quadrupole. We show that the signal is small, but detectable with future experiments for bulk flows as large as some recent reports.
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