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Due to the breaking of gauge symmetry in rotating superfluid Helium, theinertial mass of a vortex diverges with the vortex size. The vortex inertialmass is thus much higher than the classical inertial mass of the vortex core.An equal increase of the vortex gravitational mass is questioned. Thepossibility that the vortices in a rotating superfluid could break the weakequivalence principle in relation with a variable speed of light in thesuperfluid vacuum is debated. Experiments to test this possibility areinvestigated on the bases that superfluid Helium vortices would not fall, underthe single influence of a uniform gravitational field, at the same rate as therest of the superfluid Helium mass.

Are vortices in rotating superfluids breaking the Weak Equivalence Principle?