AI 中文总结
研究宇宙学对撞机模型中初始条件含有的极高能粒子物理信息，开发新模拟方法，测量振荡晕偏差，发现其与晕质量等相关，信号独特不易被模拟，模拟及代码已公开。
AI 中文摘要
我们宇宙的初始条件包含了关于极高能量粒子物理学的丰富信息。一类名为宇宙学对撞机的特征会在原初密度场的三点关联（或双谱）中产生振荡，进而在晕偏差中留下与尺度相关的振荡印记。我们开发了一种新方法来模拟宇宙学对撞机模型，摒弃了传统基于模板的基分解方法，能以百分比级精度重现输入模板的尺度相关信号。利用此方法，我们对一类对撞机模型进行了模拟，并首次在模拟中测量了振荡晕偏差。振荡的幅度和相位明显依赖于晕质量，晕质量变化十倍会导致振荡位置有两倍的偏移。增加原初双谱模型的频率会抑制晕偏差中的信号。信号相位也对组装偏差敏感。在所有情况下，尺度相关的晕偏差可用简单的峰值背景分离理论精确建模。振荡及其质量/选择相关的相位偏移是独特特征，不易被已知观测系统误差模拟，是更可靠的目标。我们的模拟和基础初始条件代码均已公开。
英文摘要
The initial conditions of our Universe contain a wealth of information about the particle physics of very high energies. One such class of signatures, called cosmological colliders, generates oscillations in the three-point correlations (or bispectra) of the primordial density field, and these imprint scale-dependent oscillations in the halo bias. We develop a new method for simulating cosmological collider models that foregoes traditional template-based basis-decomposition methods and can reproduce the scale-dependent signals of the input template at percent-level accuracy. Using this method, we produce simulations for one class of collider models and present the first measurements of oscillating halo bias in simulations. The amplitude and phase of the oscillations show a clear dependence on halo mass, with a factor of ten shift in halo mass causing a factor of two shift in the location of the oscillations. Increasing the frequency of the primordial bispectra model suppresses the signal in the halo bias, as the oscillations average down over the window function of the halo. The phase of the signal is also sensitive to assembly bias. In all cases, the scale-dependent halo bias can be accurately modeled using a simple peak background-split theory. The oscillations and their mass/selection-dependent phase offsets are a unique signature that is not easily mimicked by known observational systematics and is therefore a more robust target. Our simulations and underlying initial conditions code are both made publicly available.
