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arXiv 1107.5548astro-ph.CO
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从大角度CMB各向异性对CPT违背的WMAP 7年限制

WMAP 7 year constraints on CPT violation from large angle CMB anisotropies

A. Gruppuso, P. Natoli, N. Mandolesi, A. De Rosa, F. Finelli, F. Paci

摘要:

我们利用WMAP 7年数据中的大角度尺度(可达$\sim 4^\circ$)信号来约束CMB光子线偏振的旋转角$α$。在这些尺度上,CMB偏振模式探测的主要是再电离时代。一个真正的旋转可以解释为宇宙学双折射,这是一个众所周知的新物理的示踪剂,通过基本对称性的崩溃。我们的分析提供了$α= -1.6^{\circ} \pm 1.7^{\circ} (3.4^{\circ})$,其C.L.为68%(95%)。对于多极范围$Δ\ell = 2-47$,不包括WMAP小组估计为$\pm 1.5^\circ$的仪器系统不确定性。这改进了WMAP团队获得的边界(Komatsu等人,2010年)。此外,我们表明,第一次在低多极,角功率谱$α_\ell$在搜索一个可能的尺度依赖的双折射效应。我们的研究结果是兼容的,没有检测到在所有角度尺度探测这里。最后,我们预测了普朗克在收紧现有约束方面的能力。

英文摘要:

We constrain the rotation angle $α$ of the linear polarization of CMB photons using the large angular scale (up to $\sim 4^\circ$) signal in WMAP 7 year data. At these scales, the CMB polarization pattern probes mostly the reionization era. A genuine rotation may be interpreted as cosmological birefringence, which is a well known tracer of new physics, through the breakdown of fundamental symmetries. Our analysis provides $α= -1.6^{\circ} \pm 1.7^{\circ} (3.4^{\circ})$ at 68% (95%) C.L. for the multipoles range $Δ\ell = 2-47$ not including an instrumental systematic uncertainty that the WMAP team estimates at $\pm 1.5^\circ$. This improves the bound obtained by WMAP team (Komatsu et al., 2010). Moreover we show, for the first time at low multipoles, the angular power spectrum $α_\ell$ in search of a possible scale dependence of the birefringence effect. Our findings are compatible with no detection at all angular scales probed here. We finally forecast the capabilities of Planck in tightening the present constraints.

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