Rotational superradiance affects the dynamics of many rotating systems in nature, through either stimulated or spontaneous extraction of energy and angular momentum. By now, this process is well-studied in the relativistic setting, where systems are intrinsically dispersion-free. In many condensed matter systems, however, dispersion is an unavoidable aspect of the description for the short wavelength modes. For these systems, how might one expect superradiance to be modified? In this work, an answer to this question is provided using an illustrative example. The scattering of linear excitations of a Bose–Einstein condensate (BEC) are studied in the presence of a rotating, draining vortex flow using the full Bogoliubov dispersion relation. It is shown that dispersion suppresses the extraction of energy and angular momentum, firstly, by decreasing the superradiant bandwidth, and secondly, by preventing high-angular momentum modes from superradiating.

旋转超辐射通过受激或自发提取能量和角动量影响自然界中许多旋转系统的动力学。到目前为止，这个过程在相对论环境中得到了很好的研究，其中系统本质上是无色散的。然而，在许多凝聚态系统中，色散是短波长模式描述中不可避免的一个方面。对于这些系统，人们如何期望修改超辐射？在这项工作中，使用说明性示例提供了这个问题的答案。使用完整的 Bogoliubov 色散关系研究了在旋转、排水涡流存在的情况下，玻色-爱因斯坦凝聚 (BEC) 的线性激发的散射。结果表明，色散抑制了能量和角动量的提取，首先，