费米子shock waves -耗散还是色散？
Fermionic shock waves - dissipative or dispersive?
摘要：
最近观察到两团费米气体在么正性（UFG）下的碰撞会产生激波，激波的正则化机制是耗散的还是色散的，目前还存在争议。而经典的，耗散冲击，如在气体动力学中，发展一个陡峭的，局部的冲击波阵面，以明确定义的速度平移，分散正则化的冲击是由两个速度，即前缘和后缘的短波长振荡的扩展区域的区别。对于典型的UFG实验条件，理论振荡长度尺度小于目前成像系统的分辨率，因此不清楚如何单独从其结构确定激波类型。提出了两种实验方法，以确定适当的正则化机制：测量的冲击速度和观察的一维碰撞实验与足够紧密的径向约束。
英文摘要：
The collision of two clouds of Fermi gas at unitarity (UFG) has been recently observed to lead to shock waves whose regularization mechanism, dissipative or dispersive, is being debated. While classical, dissipative shocks, as in gas dynamics, develop a steep, localized shock front that translates at a well-defined speed, dispersively regularized shocks are distinguished by an expanding region of short wavelength oscillations with two speeds, those of the leading and trailing edges. For typical UFG experimental conditions, the theoretical oscillation length scale is smaller than the resolution of present imaging systems so it is unclear how to determine the shock type from its structure alone. Two experimental methods to determine the appropriate regularization mechanism are proposed: measurement of the shock speed and observation of a one-dimensional collision experiment with sufficiently tight radial confinement.
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