New Extraction of the Cosmic Birefringence from the Planck 2018 Polarization Data.
New Extraction of the Cosmic Birefringence from the Planck 2018 Polarization Data.
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DOI：
10.1103/physrevlett.125.221301
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发表时间：
2020-11
影响因子：
8.6
通讯作者：
Y. Minami;E. Komatsu
中科院分区：
文献类型：
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作者：
Y. Minami;E. Komatsu
我们在普朗克 2018 年偏振数据中寻找宇称破缺物理学的证据，并报告了宇宙双折射角 β 的新测量。先前的测量受到普朗克探测器绝对偏振角的系统不确定性的限制。我们通过使用观察到的宇宙微波背景 E 模式和 B 模式偏振与银河前景发射的互相关同时确定 β 和角度校准误差，完全减轻了这种系统不确定性。我们表明，系统误差得到了有效缓解，不确定性比之前的测量小了 2 倍，发现 β=0.35±0.14 度 (68% C.L.)，其中不包括 99.2% C.L. 时的 β=0。这对应于 2.4σ 的统计显着性。
We search for evidence of parity-violating physics in the Planck 2018 polarization data and report on a new measurement of the cosmic birefringence angle β. The previous measurements are limited by the systematic uncertainty in the absolute polarization angles of the Planck detectors. We mitigate this systematic uncertainty completely by simultaneously determining β and the angle miscalibration using the observed cross-correlation of the E- and B-mode polarization of the cosmic microwave background and the Galactic foreground emission. We show that the systematic errors are effectively mitigated and achieve a factor-of-2 smaller uncertainty than the previous measurement, finding β=0.35±0.14 deg (68% C.L.), which excludes β=0 at 99.2% C.L. This corresponds to the statistical significance of 2.4σ.