发表机构
Columbia University; Université de Genève; Massachusetts Institute of Technology; The NSF AI Institute for Artificial Intelligence and Fundamental Interactions; Kavli Institute for Particle Astrophysics and Cosmology; INFN, Sezione di Ferrara; INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna; University of the Western Cape（哥伦比亚大学; 日内瓦大学; 麻省理工学院; 美国国家科学基金会人工智能与基础相互作用AI研究所; 卡维利粒子天体物理学与宇宙学研究所; 意大利国家核物理研究所费拉拉分部; 意大利国家天体物理研究所博洛尼亚天体物理与空间科学天文台; 西开普大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
利用DESI DR1星系和类星体成团数据，结合拉格朗日有效场论，首次一致纳入双谱约束原始功率谱振荡，发现对数特征偏好源于DESI与Planck的距离尺度张力，强调宇宙学边缘化的重要性。
AI 中文摘要
我们利用公开的DESI DR1星系和类星体成团数据，对原始功率谱中的振荡特征进行约束。我们的分析基于一个自定义管线，用于处理DESI DR1六个主要示踪物的红移空间功率谱和双谱，该管线采用拉格朗日有效场论建模，该理论为特征的非线性阻尼提供了原则性的重求和。我们考虑了波数线性振荡和对数振荡，并首次在搜索中一致地纳入星系双谱。我们还研究了结果对背景宇宙学的依赖性，鉴于基线宇宙学模型中DESI BAO与\textit{Planck}数据之间的张力，这一点很重要。在对$\Lambda$CDM参数进行边缘化后，我们将线性振荡和对数振荡的振幅分别约束为$A_{\rm lin}<0.033$和$A_{\rm log}<0.035$（95\\%~CL），覆盖频率范围$\omega_{\rm lin}^{\rm phys}\in(20,800)~{\rm Mpc}$和$\omega_{\rm log}\in(2.5,80)$。在远离与重子声学振荡（BAO）简并的频率处，约束达到百分级精度。固定到\textit{Planck} 2018宇宙学时，约束收紧至$A_{\rm lin}<0.024$和$A_{\rm log}<0.031$，但此时我们也发现一个$\simeq 3\sigma$的全局偏好，倾向于具有$\omega_{\rm log}\simeq 15$的对数特征，该偏好由LRG2样本主导，其局部波长与DESI最佳约束波数处的表观BAO尺度匹配。由于一旦改变宇宙学参数，该特征的偏好即消失，我们预期它是DESI与\textit{Planck}数据之间已知距离尺度张力的表现，而非原始信号。因此，我们的分析强调了在原始特征搜索中宇宙学边缘化的重要性。
英文摘要
We constrain oscillatory features in the primordial power spectrum using the public DESI DR1 galaxy and quasar clustering data. Our analysis is based on a custom pipeline for the redshift-space power spectrum and bispectrum of the six main DESI DR1 tracers, modeled with the Lagrangian effective field theory,which provides a principled resummation of the non-linear damping of the features. We consider oscillations that are linear and logarithmic in wavenumber, and, for the first time, consistently include the galaxy bispectrum in the search. We also study the dependence of the results on the background cosmology, which is important given the tension between the DESI BAO and \textit{Planck} data within the baseline cosmological model. Marginalizing over $Λ$CDM parameters, we bound the amplitude of linear and logarithmic oscillations to $A_{\rm lin}<0.033$ and $A_{\rm log}<0.035$ respectively (at 95$\%~$CL) across the frequency ranges $ω_{\rm lin}^{\rm phys}\in(20,800)~{\rm Mpc}$ and $ω_{\rm log}\in(2.5,80)$. The constraints reach percent-level precision away from the frequencies degenerate with the baryon acoustic oscillations (BAO). Fixing to the \textit{Planck} 2018 cosmology, the bounds tighten to $A_{\rm lin}<0.024$ and $A_{\rm log}<0.031$, but in this case we also find a $\simeq 3σ$ global preference for a logarithmic feature with $ω_{\rm log}\simeq 15$, dominated by the LRG2 sample, whose local wavelength matches the apparent BAO scale at wavenumbers best constrained by DESI. Since the preference for this feature disappears once the cosmological parameters are varied, we expect that it is a manifestation of the known distance-scale tension between the DESI and \textit{Planck} data rather than a primordial signal. Our analysis thus emphasizes the importance of cosmology marginalization in searches for primordial features.
Comments18 pages, 7 figures, to be submitted to PRD
