宇宙学相变：从粒子物理到引力波的半解析研究
Cosmological phase transitions: from particle physics to gravitational waves, semi-analytically
AI总结：
本文针对脉冲星计时阵列发现的随机引力波背景，提出一种半解析方法，在U(1)'共形扩展标准模型中计算超冷一级相变产生的引力波谱，避免了计算密集型模拟。
摘要：
受脉冲星计时阵列实验最近发现的随机引力波背景证据的启发，我们聚焦于其主要宇宙学解释之一，即超冷一级相变。如果得到证实，这将为探索早期宇宙动力学以及超越粒子与相互作用标准模型的相关物理提供独特机会。然而，从给定的粒子物理场景预测引力波谱需要理论上和计算上要求较高的方法。尽管已有多种工具被提出以减少不确定性并自动化这些计算，我们在此研究在$4D$理论中为$U(1)^\prime$共形扩展标准模型半解析地执行完整计算管道的可能性，从而避免计算密集型模拟。我们的方法产生准确的结果，可用于唯象学研究，并允许高效探索粒子物理模型与其宇宙学预测之间的联系。
英文摘要：
Motivated by the recent evidence of a stochastic gravitational wave background found by pulsar timing array experiments, we focus on one of the prime cosmological explanations, i.e. a supercooled first order phase transition. If confirmed, it would offer a unique opportunity to probe early Universe dynamics and the related physics beyond the Standard Model of particles and interactions. However, the prediction of the gravitational wave spectrum from a given particle physics scenario requires theoretically and computationally demanding methods. While several tools have been put forward to reduce uncertainties and automatize these computations, we study here the possibility to perform the full pipeline of computations semi-analytically in the $4D$ theory for a $U(1)^\prime$ conformal extension of the Standard Model, thus avoiding computationally intensive simulations. Our approach yields accurate results that can be used in phenomenological studies and allow for an efficient exploration of the connection between the particle physics models and their cosmological predictions.
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