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arXiv 0906.3016astro-ph.CO
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来自CMB偏振的视界尺度功率的证据

Evidence for horizon-scale power from CMB polarization

Michael J. Mortonson, Wayne Hu

摘要:

宇宙微波背景辐射的温度功率谱提供了模糊的证据,证明在原始功率谱中存在视界尺度功率,这是由于空间曲率和宇宙加速物理学的不确定性以及观测到的低四极子。目前的极化数据从WMAP提供的证据,水平尺度的权力,是强大的这些不确定性。最大尺度上的极化主要来自于z<6的散射,当宇宙完全电离时,这使得证据在更高的红移下对电离历史的变化也很可靠。功率谱中的截止被偏振限制为C=k_C/10^{-4} Mpc^{-1}<5.2(95%CL),仅略弱于平坦LCDM中的联合温度和偏振约束(C<4.2)。普朗克应该将加速时期和电离历史的任何模型的极化极限提高到C<3.6,并提供前景和系统污染的测试。

英文摘要:

The CMB temperature power spectrum offers ambiguous evidence for the existence of horizon-scale power in the primordial power spectrum due to uncertainties in spatial curvature and the physics of cosmic acceleration as well as the observed low quadrupole. Current polarization data from WMAP provide evidence for horizon-scale power that is robust to these uncertainties. Polarization on the largest scales arises mainly from scattering at z<6 when the universe is fully ionized, making the evidence robust to ionization history variations at higher redshifts as well. A cutoff in the power spectrum is limited to C=k_C/10^{-4} Mpc^{-1}<5.2 (95% CL) by polarization, only slightly weaker than joint temperature and polarization constraints in flat LCDM (C<4.2). Planck should improve the polarization limit to C<3.6 for any model of the acceleration epoch and ionization history as well as provide tests for foreground and systematic contamination.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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