论文标题
对第56届Rencontres de Moriond的2022年宇宙学会议的贡献：两极分化尘埃的瞬间扩展：捕获cmb $ b $ b $ modes与litebird的新途径
Contribution to the 2022 Cosmology session of the 56th Rencontres de Moriond: Moment expansion of polarized dust SED: A new path towards capturing the CMB $B$-modes with LiteBIRD
论文作者
论文摘要
准确表征我们银河系的两极分化灰尘发射将是决定宇宙微波背景（CMB）原始$ b $ modes的决定性的。其潜在复杂的光谱特性的不完整建模可能会导致CMB极化分析的偏见，并对张量与尺度比率$ r $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ R $偏差。沿视线和视线之间的灰尘特性的变化导致光谱能量分布（SED）的不可避免的畸变，而标准组件分离方法无法轻易预测。可以使用灰尘SED的瞬间扩展来解决这个问题，这是一种创新的参数化方法，对天空复杂性施加最小的假设。 In the recent work [Vacher \emph{et al.} (2022)]\cite{Vacher_2022}, we apply this formalism to the $B$-mode cross-angular power spectra computed from simulated \lb{} polarization data at frequencies between 100 and 402\,GHz, containing CMB, dust and instrumental noise.得益于瞬间扩展，我们可以通过与仪器瞄准的目标值兼容的分散量的张量与尺度比的无偏见值。
Characterizing accurately the polarized dust emission from our Galaxy will be decisive for the quest for the Cosmic Microwave Background (CMB) primordial $B$-modes. The incomplete modeling of its potentially complex spectral properties could lead to biases in the CMB polarization analyses and to a spurious detection of the tensor-to-scalar ratio $r$. Variations of the dust properties along and between lines of sight lead to unavoidable distortions of the spectral energy distribution (SED) that can not be easily anticipated by standard component separation methods. This issue can be tackled using a moment expansion of the dust SED, an innovative parametrization method imposing minimal assumptions on the sky complexity. In the recent work [Vacher \emph{et al.} (2022)]\cite{Vacher_2022}, we apply this formalism to the $B$-mode cross-angular power spectra computed from simulated \lb{} polarization data at frequencies between 100 and 402\,GHz, containing CMB, dust and instrumental noise. Thanks to the moment expansion, we can measure an unbiased value of the tensor-to-scalar ratio with a dispersion compatible with the target values aimed by the instrument.
