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arXiv 1503.05928astro-ph.CO
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微波背景极化对大角度相关的探测

Microwave Background Polarization as a Probe of Large-Angle Correlations

Amanda Yoho, Simone Aiola, Craig J. Copi, Arthur Kosowsky, Glenn D. Starkman

摘要:

宇宙微波背景极化的两点关联函数提供了一个物理上独立的探测,在大角度尺度下宇宙微波背景温度各向异性的相关性令人惊讶的抑制。我们调查关联函数构造从Q和U斯托克斯参数和从E和B偏振分量。这些关联函数的主要贡献来自最后散射表面的局部物理效应或来自高红移时的再电离时期,因此,如果温度抑制是由于在大于给定尺度的宇宙学度规扰动中缺乏相关性造成的,那么所有这些都应该被抑制。我们评估的相关函数的标准$Λ$ CDM宇宙学所观察到的温度关联函数的约束,并计算统计特性的大角度尺度上的抑制。未来在大角度尺度上具有最小系统误差的全天空偏振图将提供强有力的测试,以检验所观测到的温度关联函数是统计上的侥幸,还是反映了标准宇宙学模型的根本缺陷。

英文摘要:

Two-point correlation functions of cosmic microwave background polarization provide a physically independent probe of the surprising suppression of correlations in the cosmic microwave background temperature anisotropies at large angular scales. We investigate correlation functions constructed from both the Q and U Stokes parameters and from the E and B polarization components. The dominant contribution to these correlation functions comes from local physical effects at the last scattering surface or from the epoch of reionization at high redshift, so all should be suppressed if the temperature suppression is due to an underlying lack of correlations in the cosmological metric perturbations larger than a given scale. We evaluate the correlation functions for the standard $Λ$CDM cosmology constrained by the observed temperature correlation function, and compute statistics characterizing their suppression on large angular scales. Future full-sky polarization maps with minimal systematic errors on large angular scales will provide strong tests of whether the observed temperature correlation function is a statistical fluke or reflects a fundamental shortcoming of the standard cosmological model.

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