https://doi.org/10.1140/epjst/e2018-800024-0
Regular Article
Hydrodynamic response of a trapped superfluid to a periodic perturbation
Laboratoire Kastler Brossel, ENS-PSL Research University,
CNRS, Sorbonne Université, Collège de France, 24 rue Lhomond,
75005 Paris, France
a e-mail: chevy@lkb.ens.fr
Received:
20
February
2018
Received in final form:
18
June
2018
Published online: 24 January 2019
In this article, we discuss the hydrodynamic response of a superfluid to a periodic drive. Using a WKB description of the hydrodynamic modes of the system, we show that contrary to Landau’s argument, there is no critical velocity, but that the dissipated power nevertheless increases rapidly when the maximum velocity of the perturbation reaches the central sound velocity of the superfluid.
© EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature, 2019
