AI 中文总结
该研究用现代理论工具构建原初双谱库，结合普朗克数据和采样技术，对多场暴胀拉格朗日量进行贝叶斯探索，分析标量场交换及自相互作用，首次研究强混合对撞机，未发现新物理证据。
AI 中文摘要
宇宙对撞机计划通过寻找暴胀粒子交换引起的微妙振荡特征来探测超高能物理。由于暴胀中通常假设的非线性对称性，这些信号并非孤立出现，其振幅受微扰性和幺正性限制。为全面探测宇宙对撞机物理，我们联合分析完整的多场暴胀拉格朗日量，研究单、双、三标量场交换及自相互作用。利用现代理论工具构建大量树级原初双谱库，结合普朗克对暴胀形状函数的测量及现代采样技术，进行八参数多场似然性的贝叶斯探索。此前多数研究假设弱混合，而我们的伴随研究表明该假设除最小质量外与当前数据集不兼容。通过数值求解暴胀双谱，我们首次分析强混合对撞机，发现普朗克约束比理论边界紧得多，振荡贡献被严重抑制。在整个多场图景中，未发现新物理证据，最大\(\chi^2\)改进为\(5.3\)。
英文摘要
The cosmological collider program probes ultra-high-energy physics by searching for subtle oscillatory signatures induced by inflationary particle exchange. Due to the non-linear symmetries usually assumed in inflation, these signals do not appear in isolation; moreover, their amplitudes are bounded by perturbativity and unitarity. To comprehensively probe cosmological collider physics, we must jointly analyze the full multi-field inflationary Lagrangian: in this work, we conduct such a study, probing single, double, and triple scalar field exchange and self-interactions across a wide range of masses (in both the complementary and principal series), mixings, and sound-speeds. Using modern theoretical tools (including the cosmological bootstrap and the cosmological flow), we construct a vast library of tree-level primordial bispectra: combining these with recent measurements of the inflationary shape function from Planck and modern sampling techniques, we perform Bayesian exploration of the eight-parameter multi-field likelihood. Most previous studies of cosmological collider physics assume weak mixing, such that the coupling between the scalar field and the Goldstone mode can be treated perturbatively: in our companion study, we demonstrate that this assumption is incompatible with current datasets except at the smallest masses. By solving for the inflationary bispectra numerically using CosmoFlow, we perform the first analysis of the strongly-mixed collider, demonstrating that the Planck constraints are much tighter than the theoretical bounds, though the oscillatory contributions are heavily suppressed. Across the full multi-field landscape, we find no evidence for new physics with a maximal $χ^2$ improvement of $5.3$.
Comments25 pages, 12 figures, submitted to Phys. Rev. D. Interactive bispectrum visualizer available at https://oliverphilcox.github.io/cosmological-collider-bispectra/
