邪恶轴心-两极分化的观点
The axis of evil - a polarization perspective
摘要：
我们寻找一个不寻常的对齐的四极和八极，所谓的邪恶轴，在CMB温度和偏振数据从WMAP的首选轴。我们使用的偏振图的一部分，这是不相关的温度图作为一个统计独立的探测轴的邪恶，这有助于评估后者是否有一个宇宙学的起源，或者如果仅仅是一个机会的温度波动。但是，请注意，对于某些在温度图中创建首选轴的模型，我们不会期望在不相关的偏振图中看到该轴。我们发现，在我们的测量精度范围内，不相关极化图的四极轴大致与邪恶轴对齐，而八极轴则不然。然而，由于我们的测量不确定性，在各向同性宇宙中偶然发生这种情况的概率为50%。我们还发现，在CMB温度图中存在的所谓冷点在温度图中与偏振无关的部分甚至更冷，尽管后者仍然存在很大的不确定性。因此，我们对邪恶轴的分析和未来对不相关温度数据中冷点的分析将大大受益于普朗克卫星预期的偏振数据。
英文摘要：
We search for an unusual alignment of the preferred axes of the quadrupole and octopole, the so-called axis of evil, in the CMB temperature and polarization data from WMAP. We use the part of the polarization map which is uncorrelated with the temperature map as a statistically independent probe of the axis of evil, which helps to assess whether the latter has a cosmological origin or if is a mere chance fluctuation in the temperature. Note, though, that for certain models creating a preferred axis in the temperature map, we would not expect to see the axis in the uncorrelated polarization map. We find that the axis of the quadrupole of the uncorrelated polarization map roughly aligns with the axis of evil within our measurement precision, whereas the axis of the octopole does not. However, with our measurement uncertainty, the probability of such a scenario to happen by chance in an isotropic universe is of the order of 50 per cent. We also find that the so-called cold spot present in the CMB temperature map is even colder in the part of the temperature map which is uncorrelated with the polarization, although there is still a large uncertainty in the latter. Therefore, our analysis of the axis of evil and a future analysis of the cold spot in the uncorrelated temperature data will strongly benefit from the polarization data expected from the Planck satellite.
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