扩展宇宙碰撞器：来自BOSS的新缩放 regime 和约束
Extending the Cosmological Collider: New Scaling Regimes and Constraints from BOSS
AI总结：
本文研究了通过inflaton与额外场的直接耦合产生的振荡非高斯性，揭示了其在宇宙大尺度结构中的观测特征，并利用BOSS数据对新参数空间进行了约束。
摘要：
原始非高斯性由膨胀期间的额外场生成，提供了一个有说服力的观测目标。重场在inflaton的非高斯相关函数中留下特征振荡信号，这一过程有时被称为宇宙碰撞物理。这些独特的特征是探索极高能物理的窗口，但通常被抑制，使标准等边非高斯性成为许多场景中最有希望的发现通道。在本文中，我们表明inflaton与额外场之间的直接耦合可以导致多种新的、有观测相关性的信号，这些信号打开新的参数领域，同时表现出轻场和重场的特性。我们识别这些原始特征在宇宙大尺度结构的晚期观测中，其中它们最显著地修改了银河系功率谱的尺度依赖性偏置，以包括围绕非平凡幂律的振荡调制。我们探索了这些模型中出现的所有现象学参数范围，并研究了当前和未来银河系调查的灵敏度，发现这种新的原始非高斯性在近期内的调查中特别容易被发现，因为它有振荡特征。最后，我们对BOSS DR12的最终发布数据进行了分析。虽然我们没有发现信号的证据，但我们在非振荡情景下展示了显著的灵敏度改进，并对这种扩展参数空间的振荡非高斯性设定了首次约束。
英文摘要：
Primordial non-Gaussianity generated by additional fields during inflation offers a compelling observational target. Heavy fields imprint characteristic oscillatory signals in non-Gaussian correlation functions of the inflaton, a process sometimes referred to as cosmological-collider physics. These distinct signatures are compelling windows into ultra-high-energy physics, but are often suppressed, making standard equilateral non-Gaussianity the most promising discovery channel in many scenarios. In this paper, we show that direct couplings between the inflaton and additional fields can lead to a wide variety of novel, observationally relevant signals which open new parameter regimes that simultaneously exhibit the characteristics of light and heavy fields. We identify these primordial signatures in the late-time observables of the large-scale structure of the Universe, where they most significantly modify the scale-dependent bias of the galaxy power spectrum to include an oscillatory modulation around a non-trivial power law. We explore the full range of parameters that phenomenologically arise in these models and study the sensitivity of current and future galaxy surveys, finding that this new class of primordial non-Gaussianity is particularly accessible in near-term surveys due to its oscillatory feature. Finally, we perform an analysis of existing data from the final release of the Baryon Oscillation Spectroscopic Survey (BOSS DR12). While we find no evidence for a signal, we demonstrate significant improvements in sensitivity over respective non-oscillatory scenarios and place the first constraints on this extended parameter space of oscillatory non-Gaussianity.
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