AI 中文总结
LiteBIRD任务旨在绘制全天微波偏振图以测试暴胀模型等。改革后简化了载荷配置，单个望远镜覆盖多频段。将在特定轨道观测3年，目标是实现张量与标量比的低不确定性，其灵敏度在多领域研究中有独特优势，本文总结了相关内容。
AI 中文摘要
LiteBIRD是一项由日本宇宙航空研究开发机构主导的太空任务，旨在绘制全天微波偏振图。其主要科学目标是通过测量原初引力波产生的宇宙微波背景B模式偏振来测试代表性的暴胀模型，同时为宇宙学、粒子物理学和天体物理学提供新见解。在2024年任务定义审查后的改革活动中，任务概念得到更新。当前概念保留了核心科学目标，简化了有效载荷配置：单个望远镜覆盖12个频段，中心频率跨度为40至402GHz，对应光学覆盖范围为34至448GHz。望远镜是孔径为500mm的交叉龙反射器，冷却至约5K，并与工作在0.1K的过渡边缘传感器测辐射热计阵列耦合。LiteBIRD将在围绕日地L2点的李萨如轨道上进行为期3年的名义观测。主要科学目标是在张量与标量比中实现总不确定性δr<0.002（68%置信水平），包括前景残留、统计不确定性、仪器系统误差和余量应急的贡献。还分别针对再电离和复合多极范围内的低频、中频和高频范围规定了相应的地图噪声要求。这种灵敏度使LiteBIRD不仅在暴胀科学方面独一无二，而且在广泛的科学研究中也具有独特性，这些研究探索早期和晚期宇宙的历史以及天体物理过程，包括银河系科学。本文总结了科学目标、更新后的有效载荷和仪器概念、观测策略以及地面段计划。
英文摘要
LiteBIRD is a JAXA-led space mission designed to produce all-sky microwave polarization maps. Its primary science goal is to test representative inflationary models by measuring the cosmic microwave background $B$-mode polarization generated by primordial gravitational waves, while also providing new insights into cosmology, particle physics, and astrophysics. The mission concept has been updated following the reformation activities initiated after the Mission Definition Review in 2024. The current concept preserves the central scientific objectives, while simplifying the payload configuration: a single telescope covers 12 frequency bands with band centers spanning 40 to 402~GHz, corresponding to an optical coverage of 34--448~GHz. The telescope is a cross-Dragone reflector with a 500~mm aperture diameter, cooled to approximately 5~K and coupled to transition-edge-sensor bolometer arrays operated at 0.1~K. LiteBIRD will observe from a Lissajous orbit around the Sun--Earth L2 point during a nominal 3-year survey. More specifically, the primary scientific objective is to achieve total uncertainty in the tensor-to-scalar ratio of $δr < 0.002$ (68\% C.L.), including contributions from foreground residuals, statistical uncertainties, instrumental systematics, and margin contingency. The corresponding map-noise requirements are specified separately for the low-, mid-, and high-frequency ranges over the reionization and recombination multipole ranges. This sensitivity makes LiteBIRD unique not only for inflationary science but also for a broad range of scientific investigations probing the history of both the early and late Universe, as well as for astrophysical processes, including Galactic science. This paper summarizes the scientific objectives, updated payload and instrument concepts, observation strategy, and ground segment plans.
Comments11 pages, 3 figures, 2 tables. SPIE Astronomical Telescopes + Instrumentation 2026
