Article ID Journal Published Year Pages File Type
5494499 Nuclear Physics B 2017 40 Pages PDF
Abstract
We study the winding number susceptibility 〈I2〉 in a superfluid system and the topological susceptibility 〈Q2〉 in QCD. We argue that both correlation functions exhibit similar structures, including the generation of the contact terms. We discuss the nature of the contact term in superfluid system and argue that it has exactly the same origin as in QCD, and it is related to the long distance physics which cannot be associated with conventional microscopical degrees of freedom such as phonons and rotons. We emphasize that the conceptual similarities between superfluid system and QCD may lead, hopefully, to a deeper understanding of the topological features of a superfluid system as well as the QCD vacuum.
Related Topics
Physical Sciences and Engineering Mathematics Mathematical Physics
Authors
,