各向异性开放宇宙中的极化点
Polarized Spots in Anisotropic Open Universes
摘要：
我们计算的温度和偏振模式中产生的各向异性宇宙模型从比安基分类。我们发现，局部功能的温度模式，也许类似于在威尔金森微波各向异性探测器（WMAP）的数据中观察到的冷点，可以产生在模型中具有负空间曲率，即比安基类型V和VII $_{h}$。这两种模型也产生相干偏振模式。然而，在Bianchi VII $_h$中，当光沿着测地线传播时偏振角的旋转可以将E模式转换为B模式，但在Bianchi V中，情况不一定如此。因此，在原则上可以产生局部温度特征，而不违反现有观测对宇宙微波背景极化奇宇称分量的限制。
英文摘要：
We calculate the temperature and polarization patterns generated in anisotropic cosmological models drawn from the Bianchi classification. We show that localized features in the temperature pattern, perhaps similar to the cold spot observed in the Wilkinson Microwave Anisotropy Probe (WMAP) data, can be generated in models with negative spatial curvature, i.e. Bianchi types V and VII$_{h}$. Both these models also generate coherent polarization patterns. In Bianchi VII$_h$, however, rotation of the polarization angle as light propagates along geodesics can convert E modes into B modes but in Bianchi V this is not necessarily the case. It is in principle possible, therefore, to generate localized temperature features without violating existing observational constraints on the odd-parity component of the polarization of the cosmic microwave background.
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