发表机构
Max Planck Institute for Physics, Werner-Heisenberg-Institut; Max Planck-IAS-NTU Center for Particle Physics, Cosmology and Geometry（马克斯·普朗克物理研究所，维尔纳·海森堡研究所; 马克斯·普朗克-IAS-南洋理工大学粒子物理、宇宙学与几何中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文证明多场暴胀在双谱压缩极限中普遍产生几乎局域的宇宙学对撞机信号，并揭示大场数下标度维度趋向幺正性边界，源于极值统计与随机矩阵普适性。
AI 中文摘要
我们证明，正如具体紫外嵌入所预测的，具有大量场的暴胀在双谱压缩极限中普遍产生几乎局域的宇宙学对撞机信号。我们构造了曲率扰动与$N_{\rm f}$个额外场之间最一般的破缺助推混合，并提取了决定宇宙学关联函数软极限的晚期标度维度。对于少数场，增强的压缩极限（可能带有振荡）是一种精细调节的信号。然而，在大$N_{\rm f}\sim100$时，混合普遍驱动标度维度趋向幺正性边界。我们表明，这是极值统计和随机矩阵普适性的直接结果，将几乎局域的双谱形状转化为对几乎所有质量和混合的普遍预测。
英文摘要
We show that inflation with a large number of fields, as predicted by concrete ultraviolet embeddings, generically produces almost-local cosmological collider signals in the bispectrum squeezed limit. We construct the most general boost-breaking mixings between the curvature perturbation and $N_{\rm f}$ additional fields, and extract the late-time scaling dimensions that dictate the soft limits of cosmological correlators. For a handful of fields, an enhanced squeezed limit (with potential oscillations) is a fine-tuned signal. At large $N_{\rm f}\sim100$, however, mixings generically drive the scaling dimensions toward the unitarity boundary. We show that this is a direct consequence of extreme value statistics and random-matrix universality, turning an almost-local bispectrum shape into a generic prediction for almost any masses and mixings.
Comments6 pages without appendices, 8 figures, 3 tables
