星系密度、速度与椭率的广角关联中的偶极功率不对称性
Dipolar power asymmetry in wide-angle correlations of galaxy density, velocity and ellipticity
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中文总结 AI 辅助
本研究针对原初功率谱的位置依赖型偶极调制，建立了全天空形式体系，发现张角≥30°时广角修正不可忽略，未来大尺度结构巡天检验偶极调制需纳入该修正。
中文摘要 AI 辅助
宇宙的大尺度结构有望探测宇宙微波背景观测所暗示的异常现象。本研究聚焦于原初功率谱的位置依赖型偶极调制，建立了计算星系密度、速度与椭率关联函数的全天空形式体系。通过对比采用平面平行近似与未采用该近似所得的关联函数，表明当张角Θ≥30°时，广角修正不可忽略。研究结果证实，在利用未来大尺度结构巡天检验偶极调制时，必须考虑广角修正。
英文摘要
The large-scale structure of the universe has the potential to probe anomalies suggested by observations of the cosmic microwave background. In this work, we focus on a position-dependent dipolar modulation of the primordial power spectrum and develop a full-sky formalism for computing correlation functions of galaxy density, velocity and ellipticity. By comparing the correlation functions obtained with and without the plane-parallel approximation, we show that wide-angle corrections become non-negligible for opening angles $Θ\gtrsim 30^\circ$. Our results demonstrate that wide-angle corrections must be taken into account when testing the dipolar modulation with future large-scale structure surveys.
