论文标题
与Bogoliubov分散的旋转超高式
Rotational superradiance with Bogoliubov dispersion
论文作者
论文摘要
旋转超鼓会通过能量和角动量的刺激或自发提取来影响自然界许多旋转系统的动力学。到现在为止，在相对论的环境中，该过程已经进行了充分研究，其中系统本质上无分散。但是，在许多冷凝物质系统中，分散是短波长模式描述的一个不可避免的方面。对于这些系统，人们如何期望修改超赞？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Bose-Einstein冷凝物的线性激发的散射。结果表明，色散首先通过减少超级带宽来抑制能量和角动量的提取，其次，通过防止高角度动量模式的超辐射来抑制能量和角动量。
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 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.
