Robust forecasts on fundamental physics from the foreground-obscured, gravitationally-lensed CMB polarization
Robust forecasts on fundamental physics from the foreground-obscured, gravitationally-lensed CMB polarization
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DOI：
10.1088/1475-7516/2016/03/052
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发表时间：
2015-09
影响因子：
6.4
通讯作者：
J. Errard;S. Feeney;H. Peiris;A. Jaffe
中科院分区：
文献类型：
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作者：
J. Errard;S. Feeney;H. Peiris;A. Jaffe
BICEP、Keck阵列和Planck合作的最新结果表明，在寻找宇宙微波背景(CMB)偏振中存在膨胀引力波的证据时，银河系前景是一个不可避免的障碍。在前景之外，通过干预大规模结构而产生的透镜效应进一步掩盖了除当前数据允许的最强通胀信号之外的所有信号。由于有大量正在进行和即将进行的旨在测量这些特征的实验，仔细和自我一致地考虑实验的前景和透镜去除能力对于获得对其性能的可信预测至关重要。我们调查了高级ACTPol、BICEP3和Keck阵列、CLASS、EBEX10K、Piper、Simons Array、SPT-3G和Spider等仪器以及CORE+、LiteBIRD-EXT、Pixie和Stage IV等项目的能力，以清除原始多频数据中由于极化同步加速器和尘埃造成的污染，并从产生的联合添加的CMB地图中去除透镜(使用迭代的CMB-Only技术或通过与外部数据的交叉关联)。结合这些影响，我们对这些实验在膨胀物理、中微子扇区和暗能量参数方面的制约力量提出了预测。该工具通过在线界面公开提供，使下一代CMB实验能够前台验证他们的设计，优化他们的频率覆盖范围以最大限度地提高科学产出，并确定哪里的交叉实验协作最有好处。我们发现，在互补的组合中分析来自地面、气球和空间仪器的数据可以显著改善单独数据集的分量分离性能、去分化和宇宙学约束。特别是，我们发现，2020年后的地面和空间实验相结合，经过分量分离和迭代去偏移后，可以获得诸如σ(R)∼1.3x10−4，σ(NT)∼0.03，σ(Ns)∼1.8×10−3，σ(αS)∼1.7×10−3，σ(Mν)∼31 MeV，σ(W)∼0.09，σ(W0)∼0.25，0σ(WA)∼0.5，σ(Neff)∼0.024和σ(Ωk)∼1.5×10−3等约束条件。
Recent results from the BICEP, Keck Array and Planck Collaborations demonstrate that Galactic foregrounds are an unavoidable obstacle in the search for evidence of inflationary gravitational waves in the cosmic microwave background (CMB) polarization. Beyond the foregrounds, the effect of lensing by intervening large-scale structure further obscures all but the strongest inflationary signals permitted by current data. With a plethora of ongoing and upcoming experiments aiming to measure these signatures, careful and self-consistent consideration of experiments' foreground- and lensing-removal capabilities is critical in obtaining credible forecasts of their performance. We investigate the capabilities of instruments such as Advanced ACTPol, BICEP3 and Keck Array, CLASS, EBEX10K, PIPER, Simons Array, SPT-3G and SPIDER, and projects as COrE+, LiteBIRD-ext, PIXIE and Stage IV, to clean contamination due to polarized synchrotron and dust from raw multi-frequency data, and remove lensing from the resulting co-added CMB maps (either using iterative CMB-only techniques or through cross-correlation with external data). Incorporating these effects, we present forecasts for the constraining power of these experiments in terms of inflationary physics, the neutrino sector, and dark energy parameters. Made publicly available through an online interface, this tool enables the next generation of CMB experiments to foreground-proof their designs, optimize their frequency coverage to maximize scientific output, and determine where cross-experimental collaboration would be most beneficial. We find that analyzing data from ground, balloon and space instruments in complementary combinations can significantly improve component separation performance, delensing, and cosmological constraints over individual datasets. In particular, we find that a combination of post-2020 ground- and space-based experiments could achieve constraints such as σ(r)∼1.3×10−4, σ(nt)∼0.03, σ( ns )∼1.8×10−3, σ(αs)∼1.7×10−3, σ( Mν )∼31 meV, σ( w )∼0.09, σ( w0 )∼ 0.25, 0σ( wa )∼ 0.5, σ( Neff )∼0.024 and σ( Ωk )∼1.5×10−3, after component separation and iterative delensing.