标题： 非微扰评估参数共振受噪声增强的量子粒子产生 显示英文标题

标题： Nonperturbative evaluation of quantum particle production in parametric resonance enhanced by noise

摘要： 报道了数值研究以支持基于含噪声效应的参数共振来解释晚期暴胀时期粒子产生的想法。两种非微扰重正化群公式被用于数值计算粒子数的时间演化。首先，应用动力学重正化群（DRG）方法来累积非定域贡献。其次，由于噪声效应的存在，我们推导出了粒子数的精确演化方程，这令人惊讶地成为可能。我们的数值结果表明，粒子产生有显著增强，与早期工作在定性上一致。比较了基于这两种方法的数值结果。我们的工作为暴胀宇宙学中的粒子产生提供了非微扰且定量的方法。 显示英文摘要

摘要： Numerical studies are reported to support the idea to explain the particle production in late inflationary era based on the parametric resonance with a noise effect. Two nonperturbative renormalization group formulations are used to numerically calculate the time evolution of particle numbers. Firstly, the dynamical renormalization group (DRG) method is applied to sum up the secular contributions. Secondly, we derive an exact evolution equation of the particle number which turned out to be possible surprisingly owing to the presence of the noise effect. Our numerical results show a drastic enhancement of the particle production in agreement with earlier works qualitatively. A comparison is made of numerical results based on two methods. Our work provides nonperturbative and quantitative methods to evaluate the particle production for the inflationary cosmology.