标题： 有限温度下假真空衰变的数值模拟 显示英文标题

标题： Numerical simulation of the false vacuum decay at finite temperature

摘要： 假真空衰变率在理解宇宙方面具有重要意义，例如早期宇宙中的对称性破缺过程和我们宇宙的年龄，这通常在场论中通过鞍点近似进行计算。 利用量子场论中Wigner函数的扩展，我们通过路径积分数值计算假真空的衰变率。 我们研究了热涨落情景下的衰变率及其与势能形状的关系，发现假真空衰变遵循指数衰减率，当系统初始能量减少和势能高度增加时，真空衰变速度会降低。 观察到模拟结果与有限温度有效场论的理论预测之间存在差异。 显示英文摘要

摘要： The false vacuum decay rate is of important meaning in understanding the Universe, such as the symmetry breaking process in the early universe and the age of our universe, which is conventionally calculated with the saddle-point approximation in the field theory. Utilizing the extension of the Wigner function in quantum field theory, we numerically calculate the decay rate of the false vacuum through path integral. We study the decay rate for the thermal fluctuation scenarios and its dependence on the potential shape, and found that the false vacuum decay occurs following an exponentially decay rate, and the speed of vacuum decay decreases when the initial energy of the system decreases and the potential height increase. The discrepancy between the simulation results and the theoretical prediction of finite temperature effective field theory is observed.