Experimental tests reveal frequency shifts in muonium transitions at varying gas pressures, suggesting density effects.
Perform the two-photon muonium 1S-2S transition measurement in ultra-high vacuum, then repeat in a chamber at 1 atm air pressure. Utilize existing setups at PSI or J-PARC. Observe any frequency shift in the gas-filled case. A downward shift would indicate radial compression from gas atoms, shortening measurement rulers microscopically and causing clock drag - consistent with the density squeeze model. This matches the clepsydra pressure cap. No quantum effects required.
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Boris Karagiannis (2026) studied this question.
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