The Aharonov-Bohm effect, often cited as confirming gauge-phase measurability, demonstrates that physically meaningful phase differences arise from electromagnetic potentials, not from Weyl's spacetime geometry.

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Aharonov-Bohm effect(quantum mechanics / electromagnetism): The quantum mechanical prediction, experimentally confirmed, that an interference pattern due to a beam of charged particles can be produced or altered by the presence of a constant magnetic field in a region from which the particles are excluded
Electromagnetic potentials(as used in physics): The underlying invisible forces (like voltage or magnetic field strength) that exist in space and cause charged particles to move and interact.
Gauge-phase measurability(as used in quantum mechanics): The idea that certain mathematical properties in physics (called 'gauge phases') can actually be measured and observed in real experiments, not just exist as abstract calculations.
Hermann Weyl(history of philosophy): A 20th-century mathematician and philosopher who thought deeply about how we measure things and what measurement means in physics.

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