Effective observer-split source terms in rotating frames and gravitomagnetic backgrounds in extended Aharonov-Bohm electrodynamics

We examine whether the observer split of a covariantly conserved electric current in a rotating finite system can provide a physically constrained effective source for the scalar sector of extended Aharonov–Bohm electrodynamics. We first recall that rotation, a stationary gravitomagnetic background, or a change of coordinates cannot by themselves generate genuine microscopic charge non-conservation for standard locally U(1)-invariant matter; this simple no-go statement is used to delimit the phenomenological. In a 3+1 decomposition adapted to a rotating apparatus, the transport continuity equation contains the exact observer-split term Isplit=N-1Di(ρβi), which reduces for weak rigid rotation to IG=Ω∂ϕρ. We propose to use this restricted, congruence-dependent source as a phenomenological input to the extended scalar sector. The relevant observer/evolution structure is not an arbitrary coordinate choice: the laboratory synchronization and readout protocol select the foliation, while the rotor motion fixes the evolution field relative to it. We characterize which features of a genuine extra-current can and cannot be represented by this construction, and discuss falsifiable signatures, including rotation reversal, axisymmetric-source suppression, gradient scaling, and a recently proposed optically gated rotating-disc test. Analogue-gravity systems are also identified as a possible future setting in which a preferred material flow naturally selects the observer congruence. © The Author(s) 2026.