论文标题
半波板系统系统对CMB极化的宇宙双折射测量的影响
Impact of half-wave plate systematics on the measurement of cosmic birefringence from CMB polarization
论文作者
论文摘要
宇宙微波背景（CMB）的极化可以探测新的均衡物理，例如宇宙双折射（CB），这需要对仪器系统学的精美控制。半波板（HWP）的非理想性表示用作极化调节器时的系统源。我们研究了它们对CMB角功率谱的影响，该谱图通过CB部分退化和极化角度校准。我们使用包括HWP在内的全套光束卷积仿真来生成模拟噪音无时订购的数据，通过平均地图制造商进行处理，并计算功能谱，包括$ tb $和$ eb $相关性。我们还得出了分析公式，该公式可以准确地模拟观察到的光谱。对于我们选择的HWP参数，HWP诱导的角度相当于几个度，可能会误解为CB。需要对HWP进行准确的了解来减轻这种情况。我们的模拟和分析公式将有助于得出HWP校准准确性的要求。
Polarization of the cosmic microwave background (CMB) can probe new parity-violating physics such as cosmic birefringence (CB), which requires exquisite control over instrumental systematics. The non-idealities of the half-wave plate (HWP) represent a source of systematics when used as a polarization modulator. We study their impact on the CMB angular power spectra, which is partially degenerate with CB and miscalibration of the polarization angle. We use full-sky beam convolution simulations including HWP to generate mock noiseless time-ordered data, process them through a bin averaging map-maker, and calculate the power spectra including $TB$ and $EB$ correlations. We also derive analytical formulae which accurately model the observed spectra. For our choice of HWP parameters, the HWP-induced angle amounts to a few degrees, which could be misinterpreted as CB. Accurate knowledge of the HWP is required to mitigate this. Our simulation and analytical formulae will be useful for deriving requirements for the accuracy of HWP calibration.
