Simulating cosmological supercooling with a cold atom system. II. Thermal damping and parametric instability
Simulating cosmological supercooling with a cold atom system. II. Thermal damping and parametric instability
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用冷原子系统模拟宇宙过冷。
DOI：
10.1103/physreva.104.053309
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发表时间：
2021
影响因子：
2.9
通讯作者：
Billam T
中科院分区：
文献类型：
--
作者：
Billam T
我们在模拟早期宇宙相变的情况下，对一维两组分玻色气体的过冷态进行了分析。我们证明了该系统的行为与热的相对论玻色气体经历一级相变的方式相同。我们提出了一种方法来制备亚稳态系统的状态，类似于早期宇宙中的过冷。我们证明，如果阻尼率与以前用于模拟非平衡实验的一些较高的阻尼率相似，那么热阻尼能抑制系统中的参数共振。然而，在我们的模型中，平衡系统的理论预测的阻尼率太弱，不能抑制共振。
We perform an analysis of the supercooled state in an analog of an early universe phase transition based on a one-dimensional, two-component Bose gas with time-dependent interactions. We demonstrate that the system behaves in the same way as a thermal, relativistic Bose gas undergoing a first-order phase transition. We propose a way to prepare the state of the system in the metastable phase as an analog to supercooling in the early universe. We show that parametric resonances in the system can be suppressed by thermal damping if the damping rate is similar to some of the higher rates previously used for modeling nonequilibrium experiments. However, the theoretically predicted damping rate for equilibrium systems within our model is too weak to suppress the resonances.