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A recent theory posits that the quantum vacuum can transfer momentum tomagnetoelectric media (the Feigel effect). Several related theories of vacuummomentum transfer to media have since been proposed. Neither these, nor theoriginal theory have been observed experimentally, the existence a Feigeleffect remaining highly contentious. Some investigations predict a measurableeffect; others conclude vacuum momentum transfer to magnetoelectric media isnot physically possible. Most analyses, including the original Fiegel theory,do not model experimentally realistic geometries and boundary conditions. Irecently provided an alternative derivation of Feigel theory applied torealistic geometries, proposing experimental tests. I show here that in suchgeometries the existence of a steady Feigel effect (time-independentmagnetoelectric susceptibilities) is equivalent to a violation of the first lawof thermodynamics. A steady Feigel effect should not exist, as confirmed by asemi-classical quantum electrodynamic analysis. However, unsteady Feigeleffects compatible with QED and thermodynamics are possible, and two such neweffects are proposed.

Does the Feigel effect break the first law?