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arXiv 1104.1634astro-ph.CO
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宇宙学双折射率与CMB温度的互相关

Cross-Correlation of Cosmological Birefringence with CMB Temperature

Robert R. Caldwell, Vera Gluscevic, Marc Kamionkowski

摘要:

新粒子和早期宇宙物理学的理论充满了当全球对称性自发破缺时产生的伪南武-戈德斯通场。这些场与电磁学的陈-西蒙斯项的耦合可能会产生宇宙双折射(CB),这是光子在宇宙距离上传播时线性偏振的频率无关旋转。CB感应场的不均匀性可能会产生在整个天空中变化的旋转角度。在这里,我们注意到,这种空间变化的双折射可能与宇宙微波背景(CMB)的温度。我们描述了这种互相关存在的精粹方案和其他情况下,标量场只是一个无质量的观众场,在这种情况下,互相关不存在。我们讨论了如何用CMB偏振测量CB旋转角和CMB温度之间的互相关。这种测量可以提高对CB信号的灵敏度,并且它可以帮助区分不同型号的CB。

英文摘要:

Theories for new particle and early-Universe physics abound with pseudo-Nambu-Goldstone fields that arise when global symmetries are spontaneously broken. The coupling of these fields to the Chern-Simons term of electromagnetism may give rise to cosmological birefringence (CB), a frequency-independent rotation of the linear polarization of photons as they propagate over cosmological distances. Inhomogeneities in the CB-inducing field may yield a rotation angle that varies across the sky. Here we note that such a spatially-varying birefringence may be correlated with the cosmic microwave background (CMB) temperature. We describe quintessence scenarios where this cross-correlation exists and other scenarios where the scalar field is simply a massless spectator field, in which case the cross-correlation does not exist. We discuss how the cross-correlation between CB-rotation angle and CMB temperature may be measured with CMB polarization. This measurement may improve the sensitivity to the CB signal, and it can help discriminate between different models of CB.

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