DEFROST：一种模拟充气后预热的新程序
DEFROST: A New Code for Simulating Preheating after Inflation
摘要：
在暴胀结束时，动力学不稳定性可以迅速地将均匀冷暴胀子的能量沉积到其他场的激发中。这一过程被称为预热，是相当剧烈、不均匀和非线性的，必须用数值方法研究。本文提出了一种新的模拟膨胀宇宙中标量场动力学的程序。与现有的替代方案相比，它显着提高了计算的速度和准确性，并完全用于3D可视化。我们重现以前发表的结果预热简单的混沌暴胀模型，并进一步研究非线性动力学的暴胀衰变。令人惊讶的是，我们发现这些场并不想像人们想象的那样热化。进化并没有直接达到平衡，而是停留在一个相当简单但相当不均匀的状态。特别是总能量密度的一点分布函数在各种双场预热模型中具有普遍性，并且可以用对数正态分布来描述。人们很容易把这种状态归因于标量场湍流。
英文摘要：
At the end of inflation, dynamical instability can rapidly deposit the energy of homogeneous cold inflaton into excitations of other fields. This process, known as preheating, is rather violent, inhomogeneous and non-linear, and has to be studied numerically. This paper presents a new code for simulating scalar field dynamics in expanding universe written for that purpose. Compared to available alternatives, it significantly improves both the speed and the accuracy of calculations, and is fully instrumented for 3D visualization. We reproduce previously published results on preheating in simple chaotic inflation models, and further investigate non-linear dynamics of the inflaton decay. Surprisingly, we find that the fields do not want to thermalize quite the way one would think. Instead of directly reaching equilibrium, the evolution appears to be stuck in a rather simple but quite inhomogeneous state. In particular, one-point distribution function of total energy density appears to be universal among various two-field preheating models, and is exceedingly well described by a lognormal distribution. It is tempting to attribute this state to scalar field turbulence.
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