  We demonstrate the way in which vortex rings in neutral superfluids are
equivalent to massive, charged, elastic strings in an electromagnetic field
defined locally on the string from a Kalb-Ramond gauge field. We argue that the
action thus obtained describes an intermediate scale of vortex motion with
phonon fluctuations of the line between the incompressible hydrodynamic
r\'egime and the microscopic one dominated by roton emission and absorption.
The formalism gives an accurate semiclassical picture of vortex string motion
and is of relevance for the description of vortex ring quantum nucleation in a
perturbation theory of the purely incompressible case.
