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arXiv 1206.5546astro-ph.COphysics.data-an
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基于WMAP-7的方向相关宇宙学双光子数的第一个CMB约束

First CMB Constraints on Direction-Dependent Cosmological Birefringence from WMAP-7

Vera Gluscevic, Duncan Hanson, Marc Kamionkowski, Christopher M. Hirata

摘要:

一个新的标量场与电磁场的陈-西蒙斯耦合可能会引起宇宙学双折射,即电磁波在宇宙学距离上传播时线偏振的旋转。先前的工作已经通过寻找均匀旋转在CMB温度/偏振中产生的违反宇称的TB和EB相关性来寻求这种旋转,假设旋转角度在整个天空中是均匀的。然而,如果引起宇宙双折射的标量场具有空间波动,那么旋转角度可能会在整个天空中变化。在这里,我们寻找方向依赖的宇宙学双折射的WMAP-7数据。我们报告的第一CMB约束的旋转角功率谱的多极L = 0和L = 512之间。我们还获得了一个68%的置信水平上限为1度的尺度不变的旋转角功率谱的四极的平方根。

英文摘要:

A Chern-Simons coupling of a new scalar field to electromagnetism may give rise to cosmological birefringence, a rotation of the linear polarization of electromagnetic waves as they propagate over cosmological distances. Prior work has sought this rotation, assuming the rotation angle to be uniform across the sky, by looking for the parity-violating TB and EB correlations a uniform rotation produces in the CMB temperature/polarization. However, if the scalar field that gives rise to cosmological birefringence has spatial fluctuations, then the rotation angle may vary across the sky. Here we search for direction-dependent cosmological birefringence in the WMAP-7 data. We report the first CMB constraint on the rotation-angle power spectrum for multipoles between L = 0 and L = 512. We also obtain a 68% confidence-level upper limit of 1 degree on the square root of the quadrupole of a scale-invariant rotation-angle power spectrum.

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