发表机构
Leinweber Institute for Theoretical Physics at Stanford; Kavli Institute for Particle Astrophysics and Cosmology（斯坦福大学莱因韦伯理论物理研究所; 卡弗里粒子天体物理与宇宙学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文发展了星系三谱的树级EFTofLSS模型，并利用N体模拟验证，发现加入三谱可将暗物质密度参数约束改善15%，为探测原初非高斯性提供新途径。
AI 中文摘要
针对光谱巡天的星系大尺度结构有效场论（EFTofLSS）方案在利用星系功率谱和双谱进行宇宙学推断方面已取得显著成功。然而，包含星系三谱的全形状宇宙学分析尚未开展。在本工作中，我们发展了星系三谱的树级EFTofLSS模型，包含了所有相关要素：星系偏袒、随机性、红外重求和、手指上帝（FoG）逆项、Alcock-Paczynski畸变、分箱效应以及协方差。我们通过利用从25个AbacusSummit N体模拟中的暗物质晕测量得到的一环星系功率谱、树级双谱和树级三谱进行宇宙学推断来验证该模型，其大有效体积（$V=200h^{-3}\text{Gpc}^3$）使我们能够测试模型的精度并确定实空间和红移空间中的尺度截断。我们还研究了在类似DESI体积中星系三谱的宇宙学信息含量，发现包含三谱可以将例如$\omega_{\rm cdm}$的约束改善高达$15\\%$。我们进一步发现，得益于对FoG效应的改进处理，最大尺度截断可以扩展到$k_{\max}=0.12h\mathrm{Mpc}^{-1}$，具体取决于示踪天体。这为利用三维大尺度结构来约束在双谱中具有独特特征的新物理场景（特别是原初非高斯性）提供了一条途径。
英文摘要
The effective field theory of large-scale structure (EFTofLSS) program for spectroscopic galaxy surveys has been remarkably successful for cosmological inference from the galaxy power spectrum and bispectrum. However, a full-shape cosmological analysis including the galaxy trispectrum has not yet been performed. In this work, we develop the tree-level EFTofLSS model of the galaxy trispectrum, including all relevant ingredients: galaxy bias, stochasticity, infrared resummation, Fingers-of-God (FoG) counterterms, Alcock-Paczynski distortions, binning effects, and covariance. We validate the model by performing cosmological inference using the one-loop galaxy power spectrum, tree-level bispectrum, and tree-level trispectrum measured from dark-matter halos in 25 AbacusSummit $N$-body simulations, whose large effective volume ($V=200h^{-3}\text{Gpc}^3$) allows us to test the precision of our model and determine scale cuts in both real-space and redshift-space. We also study the cosmological information content of the galaxy trispectrum in a DESI-like volume, finding that its inclusion can improve constraints e.g., on $ω_{\rm cdm}$ by up to $15\%$. We further find that the maximum scale cut can be extended to $k_{\max}=0.12h\mathrm{Mpc}^{-1}$ depending on the tracer, thanks to our improved treatment of FoG effects. This provides a path towards using the three-dimensional large-scale structure to constrain new-physics scenarios with distinctive signatures in the trispectrum, in particular primordial non-Gaussianity.
Comments62 pages, 15 figures
