Superfluid helium is usually framed as a consequence of microscopic quantum statistics. In practice that view does not explain why the macroscopic form is so tightly constrained. This work takes a constraint based route. Starting from covariant continuity as the invariant, and admitting only minimal hydrodynamic closure, it identifies the structures that remain admissible once stability, boundary conditions, and global phase coherence are imposed. The closure is not assumed in isolation. It is anchored in the Dirac fluid regime of ultra clean graphene, where relativistic hydrodynamics is realised directly in experiment. Superfluidity does not occur there. The analysis begins from that established closure and asks what follows when coherence is admitted. In the low temperature, low dissipation limit, admissible long lived flows are restricted toward phase coherent, irrotational configurations. This enforces phase potential structure, quantised circulation, vortex defects, persistent currents, and two component behaviour. The usual condensate and Gross Pitaevskii descriptions are recovered as effective parametrisations of this constrained sector. The work does not derive the microscopic origin of coherence or the phase action scale ℏ. It begins once coherence is present and shows that continuity, stability, and topology restrict the form of the superfluid sector prior to detailed microphysical specification. Microphysics determines parameters and material behaviour. The admissible macroscopic form is already constrained by the closure. The framework is falsifiable. It would fail if stable coherent flows were observed that do not admit a phase potential structure, or if circulation were continuously variable in a regime of sustained coherence. This is a macroscopic constraint statement for superfluidity within the Chronoflux continuity framework.
Roy Herbert (Thu,) studied this question.