用小红点约束暴胀
Constraining Inflation with Little Red Dots
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中文总结 AI 辅助
本研究利用JWST发现的小红点预测星系功率谱和双谱，以约束原初非高斯性，结果显示局部非高斯性界限比普朗克改善16倍，为暴胀物理提供新探针。
中文摘要 AI 辅助
原初非高斯性是直接探测暴胀物理的探针。最严格的界限仍来自宇宙微波背景，但大尺度结构正在迅速赶上：其固有的三维图包含更多模式，前提是示踪天体结合了大体积、高红移、强偏袒和足够的数密度。由詹姆斯·韦布空间望远镜发现的小红点（LRDs）可能提供所有这四个条件。受近期利用LRDs进行重子声学振荡测量的工作启发，我们预测了一个覆盖$4<z<9$、面积为$14{,}000\\,{\rm deg}^2$的LRD光谱巡天的联合星系功率谱和双谱，边缘化$32$个 nuisance 参数并包括非高斯双谱协方差。我们发现$\sigma(f_{\mathrm{NL}}^{\mathrm{loc}})=0.32$，$\sigma(f_{\mathrm{NL}}^{\mathrm{equil}})=32$和$\sigma(f_{\mathrm{NL}}^{\mathrm{orth}})=10$，分别比普朗克改善$16$倍、$1.5$倍和$2.3$倍。局部界限比区分单场和多场暴胀的$\sigma(f_{\mathrm{NL}}^{\mathrm{loc}})\simeq1$阈值低三倍。因此，LRD的成团性有潜力成为暴胀的重要探针，并为未来宽视场近至中红外光谱学提供了有力理由。
英文摘要
Primordial non-Gaussianity is a direct probe of the physics of inflation. The tightest bounds still come from the cosmic microwave background, but large-scale structure is rapidly catching up: its intrinsically three-dimensional maps contain far more modes, provided the tracer combines large volume, high redshift, strong bias and sufficient number density. The Little Red Dots (LRDs) discovered by JWST plausibly offer all four. Inspired by recent work on BAO measurements using LRDs we forecast the joint galaxy power spectrum and bispectrum of a $14{,}000\,{\rm deg}^2$ LRD spectroscopic survey over $4<z<9$, marginalising over $32$ nuisance parameters and including the non-Gaussian bispectrum covariance. We find $σ(f_{\mathrm{NL}}^{\mathrm{loc}})=0.32$, $σ(f_{\mathrm{NL}}^{\mathrm{equil}})=32$ and $σ(f_{\mathrm{NL}}^{\mathrm{orth}})=10$, improving on Planck by factors of $16$, $1.5$ and $2.3$. The local bound lies a factor of three below the $σ(f_{\mathrm{NL}}^{\mathrm{loc}})\simeq1$ threshold that separates broad classes of single- and multi-field inflation. LRD clustering therefore has the potential to become an important probe of inflation, and makes a strong case for future wide-field near- to mid-infrared spectroscopy.
发表机构
- Van Swinderen Institute for Particle Physics and Gravity, University of Groningen（格罗宁根大学范斯温德恩粒子物理与引力研究所）
- Department of Physics & Astronomy, University of the Western Cape（西开普大学物理与天文系）
机构由 AI 辅助整理，请以论文原文为准。
