论文标题
早期宇宙的主要热量机理从液体液体界面上的法拉第波散射观察到
Primary thermalisation mechanism of Early Universe observed from Faraday-wave scattering on liquid-liquid interfaces
论文作者
论文摘要
在过去的两百年中，已经在各种物理系统（例如流体，机械设备甚至通货膨胀宇宙学）中研究了参数不稳定性。直到几十年前，这种亚谐波不稳定的反应才成为早期宇宙热量的核心机制，这是一种称为预热的理论。在这里，我们研究了一个参数驱动的两流体界面，以通过非线性法拉第波的发作模拟通货膨胀预热动力学的关键方面。我们通过高阶相关性的分解特性，对界面波的有效现场理论描述进行了详细分析。尽管抑制且高度相互作用的流体动力学系统具有复杂性，但我们表明，大幅度法拉第波的散射仍与原发性带宽的扩展以及随后在预热动力学中预测的二次不变的外观相连。
For the past two hundred years, parametric instabilities have been studied in various physical systems, such as fluids, mechanical devices and even inflationary cosmology. It was not until a few decades ago that this subharmonic unstable response arose as a central mechanism for the thermalisation of the Early Universe, in a theory known as preheating. Here we study a parametrically driven two-fluid interface to simulate the key aspects of inflationary preheating dynamics through the onset of nonlinear Faraday waves. We present a detailed analysis of the effective field theory description for interfacial waves through the factorization properties of higher-order correlations. Despite the intricacies of a damped and highly interacting hydrodynamical system, we show that the scattering of large amplitude Faraday waves is connected to a broadening of primary resonance bands and the subsequent appearance of secondary instabilities as predicted in preheating dynamics.
