Smith Kendrick M, Ferraro Simone
Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada.
Berkeley Center for Cosmological Physics, University of California, Berkeley, California 94720, USA and Miller Institute for Basic Research in Science, University of California, Berkeley, California 94720, USA.
Phys Rev Lett. 2017 Jul 14;119(2):021301. doi: 10.1103/PhysRevLett.119.021301. Epub 2017 Jul 12.
Upcoming cosmic microwave background (CMB) experiments will measure temperature fluctuations on small angular scales with unprecedented precision. Small-scale CMB fluctuations are a mixture of late-time effects: gravitational lensing, Doppler shifting of CMB photons by moving electrons [the kinematic Sunyaev-Zel'dovich (KSZ) effect], and residual foregrounds. We propose a new statistic which separates the KSZ signal from the others, and also allows the KSZ signal to be decomposed in redshift bins. The decomposition extends to high redshift and does not require external data sets such as galaxy surveys. In particular, the high-redshift signal from patchy reionization can be cleanly isolated, enabling future CMB experiments to make high-significance and qualitatively new measurements of the reionization era.
即将开展的宇宙微波背景（CMB）实验将以前所未有的精度测量小角尺度上的温度涨落。小尺度CMB涨落是多种晚期效应的混合：引力透镜效应、CMB光子被移动电子的多普勒频移[运动学苏尼亚耶夫-泽尔多维奇（KSZ）效应]以及残余前景。我们提出了一种新的统计量，它能将KSZ信号与其他信号分离，还能使KSZ信号在红移区间内分解。这种分解能延伸到高红移，且不需要星系巡天等外部数据集。特别地，来自片状再电离的高红移信号能够被清晰地分离出来，使未来的CMB实验能够对再电离时代进行高显著性且定性全新的测量。
