BICEP/Keck XII: Constraints on axionlike polarization oscillations in the cosmic microwave background
BICEP/Keck XII: Constraints on axionlike polarization oscillations in the cosmic microwave background
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BICEP/Keck™ XII：宇宙微波背景中轴子类偏振振荡的约束
DOI：
10.1103/physrevd.103.042002
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发表时间：
2021
影响因子：
5
通讯作者：
Buza, V.
中科院分区：
文献类型：
--
作者：
Ade, P. A. R.;Ahmed, Z.;Amiri, M.;Barkats, D.;Basu Thakur, R.;Bischoff, C. A.;Bock, J. J.;Boenish, H.;Bullock, E.;Buza, V.
我们利用凯克阵列的观测结果来寻找宇宙微波背景 (CMB) 中的轴子偏振振荡。局部轴子场引起 CMB 偏振的全天空、时间正弦旋转。因此，CMB 旋光计可以用作类轴子暗物质的直接检测实验。我们开发了提取振荡信号的技术。该方法的许多要素对于 CMB 旋光实验来说是通用的，并且可以适用于其他数据集。作为第一个演示，我们处理 2012 年观测季的数据，以设定质量范围内轴子-光子耦合常数的上限，该常数对应于数小时到数月的振荡周期。我们发现与背景模型没有统计上显着的偏差。对于大于 24 小时（质量）的周期，如果轴子粒子构成所有暗物质，则中值 95% 置信上限相当于 0.68° 的旋转幅度，这将轴子-光子耦合常数限制为 gψγ<(1.1×10-11 GeV-1)m/(10-21 eV)。利用 BICEP 系列实验已经收集的数据，可以大大改善这些约束。当前和未来的 CMB 偏振测量实验预计将达到足够的灵敏度，以排除轴子参数空间中未探索的区域。
We present a search for axionlike polarization oscillations in the cosmic microwave background (CMB) with observations from theKeck Array. A local axion field induces an all-sky, temporally sinusoidal rotation of CMB polarization. A CMB polarimeter can thus function as a direct-detection experiment for axionlike dark matter. We develop techniques to extract an oscillation signal. Many elements of the method are generic to CMB polarimetry experiments and can be adapted for other datasets. As a first demonstration, we process data from the 2012 observing season to set upper limits on the axion-photon coupling constant in the mass range, which corresponds to oscillation periods on the order of hours to months. We find no statistically significant deviations from the background model. For periods larger than 24 hr (mass), the median 95% confidence upper limit is equivalent to a rotation amplitude of 0.68°, which constrains the axion-photon coupling constant to gϕγ<(1.1×10-11 GeV-1)m/(10-21 eV), if axionlike particles constitute all of the dark matter. The constraints can be improved substantially with data already collected by the BICEP series of experiments. Current and future CMB polarimetry experiments are expected to achieve sufficient sensitivity to rule out unexplored regions of the axion parameter space.