AI 中文总结
研究宇宙学对撞机分析局限性，结合数值预测与观测数据评估标量宇宙学对撞机观测可行性，发现弱混合下对撞机信号小，强混合虽能产生更大双谱但会扭曲信号，强调强混合分析对获取约束的必要性。
AI 中文摘要
暴胀期间交换的大质量场在原初曲率涨落的关联函数中产生宇宙学对撞机特征。其结构由暴胀对称性确定，但信号幅度先验未知，受诸如幺正性等物理原理限制。我们通过结合使用CosmoFlow得出的精确数值预测与普朗克双谱重建的观测数据，评估标量宇宙学对撞机的观测可行性。在戈德斯通玻色子和标量扇区之间弱二次混合的极限下（如之前所有搜索所假设），我们发现微扰性将对撞机信号限制在不可观测的小值，除了低质量下的双交换和三交换配置。通过将混合增加到非微扰（但仍幺正）值可产生更大的双谱，但这会扭曲信号，抑制其幅度并移动对撞机振荡。此外，强混合会破坏双谱分解为自由幅度和固定形状，使理论预测和观测搜索都变得复杂。尽管存在挑战，但我们认为强混合分析对于从当前和即将到来的数据集中获得对标量宇宙学对撞机有意义的约束是必要的。
英文摘要
Massive fields exchanged during inflation source cosmological collider features in the correlators of primordial curvature fluctuations. While their structure is fixed by the symmetries of inflation, the amplitude of such signatures is a priori unknown, though bounded by physical principles such as unitarity. We assess the observational viability of the scalar cosmological collider by combining precise numerical predictions derived using CosmoFlow with observational data from Planck bispectrum reconstructions. Working in the limit of weak quadratic mixing between the Goldstone and scalar sectors (as assumed by all previous searches), we find that perturbativity restricts the collider signals to be unobservably small, except for double- and triple-exchange configurations at low masses. Larger bispectra can be generated by increasing the mixing to non-perturbative (but still unitary) values: however, this distorts the signal, damping its amplitude and shifting the collider oscillations. Furthermore, strong mixing breaks the factorization of the bispectrum into a free amplitude and a fixed shape, and complicates both theoretical predictions and observational searches. Despite the challenges, we argue that strong mixing analyses are necessary to obtain meaningful constraints on the scalar cosmological collider from current and upcoming datasets.
Comments6 pages, 4 figures, submitted to PRL. Interactive bispectrum visualizer available at https://oliverphilcox.github.io/cosmological-collider-bispectra/
