Closed vortex filament in a cylindrical domain: Circulation quantization

Abstract

This article investigates quantum oscillations of a vortex ring with zero thickness that evolves in a cylindrical domain V=D×[0,L]. The symbol D denotes the planar domain, which is bounded by some closed connected curve S. The quantization scheme of this dynamical system is based on the approach proposed by the author earlier [“Small oscillations of a vortex ring: Hamiltonian formalism and quantization,” Eur. J. Mech. B/Fluids 92, 100–106 (2022); arXiv:Math-ph/2112.04859v1]. As result, we find the discrete values Γn for circulation Γ. In contrast to the traditional approach where such quantities are usually postulated, the values Γn are deduced rigorously as the consequence of the conventional scheme of quantum theory. The model demonstrates the splitting of levels also. In particular, the levels correction values depend on the domain V: both the cylinder height L and the form of the curve S affect the final formula for the quantities Γn. Moreover, we prove that the basic circulation levels demonstrate a “fine structure.” These anomalous terms, which are proportional to the value ℏ2, are calculated in the article as well. The conclusions are compared with some results of numerical simulations by other authors “Intermittency of velocity circulation in quantum turbulence,” Phys. Rev. X 11, 011053 (2021).