重构后功率谱红外效应重整化理论模型的构建（评论区有解释性视频）
Developing a Theoretical Model for the Resummation of Infrared Effects in the Post-Reconstruction Power Spectrum (an explanatory video is available in the comments section)
AI总结：
本研究针对重构后星系功率谱的红外效应问题，提出含1圈修正的新理论模型，发现纳入位移矢量非微扰红外效应后BAO非线性阻尼可用二维高斯函数描述，并证实重构前后交叉功率谱无红外抵消且呈指数衰减。
摘要：
由于星系分布重构可有效降低功率谱协方差矩阵中的非高斯项，它不仅在重子声学振荡（BAO）信号研究中受到关注，也在各类宇宙学信号分析中引发兴趣。为此，本文提出了一种全新的理论模型，用于处理重构后星系功率谱中的红外（IR）效应，包含1圈修正。具体而言，我们讨论了将红外贡献产生的非微扰效应纳入重构所用位移矢量$\boldsymbol{s}$的重要性。由此，重构后BAO的非线性阻尼可由单一二维高斯函数描述，这是在泽尔多维奇近似下将$\boldsymbol{s}$取为线性阶时未观测到的现象。此外，我们证实重构前后密度涨落的交叉功率谱不存在红外效应抵消，且交叉功率谱及相关散粒噪声项均呈现指数衰减。解释性视频可访问https://youtu.be/u1-xx3_4xCg查看。
英文摘要：
Since galaxy distribution reconstruction effectively reduces non-Gaussian terms in the power spectrum covariance matrix, it has attracted interest not only for Baryon Acoustic Oscillation (BAO) signals but also for various cosmological signal analyses. To this end, this paper presents a novel theoretical model that addresses infrared (IR) effects in the post-reconstruction galaxy power spectrum, including 1-loop corrections. In particular, we discuss the importance of incorporating non-perturbative effects arising from IR contributions into the displacement vector $\vec{s}$ used for reconstruction. Consequently, post-reconstruction nonlinear damping of BAO can be described by a single two-dimensional Gaussian function. This is a phenomenon not observed when $\vec{s}$ is considered to at a linear order in the Zel'dovich approximation. Furthermore, we confirm that the cross-power spectrum of the pre- and post-reconstruction density fluctuations lacks IR effect cancellations, and shows an exponential decay in both the cross-power spectrum and the associated shot-noise term. An explanatory video is available at https://youtu.be/u1-xx3_4xCg
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
