Speaker
Description
It is well known that superfluid phonons, which are Nambu-Goldstone modes resulting from the spontaneous breaking of $U(1)$ symmetry, can be described in terms of a dual two-form gauge field. In this two-form language, quantized vortex lines are formulated as degrees of freedom carrying dual charges.
In this work, we theoretically analyze the dynamics of a quantized vortex ring propagating in a superfluid within the framework of an effective field theory based on the two-form gauge field. Specifically, we first clarify the conditions on the radius and velocity required for a vortex ring moving at a constant speed to exist stably without collapsing. Furthermore, we investigate the damped oscillation dynamics arising from the interaction between an oscillating vortex ring and sound waves.