The Casimir Pressure With a Finite Plasma Cutoff, Tested Against the Surviving Vacuum Count

The Casimir pressure between conducting plates is the best-measured vacuum force in physics, and it depends on the electromagnetic modes at energies set by the plate separation, from a tenth of an electronvolt to several electronvolts across the usual range. This paper asks a bookkeeping question with laboratory content: if the large zero-point contributions to the gravitating vacuum density are removed by some mechanism, leaving only a surviving density of 5.253e-10 joules per cubic metre, whose characteristic scale is 2.240 milli-electronvolts, would the Casimir pressure notice? The computed answer is no at any separation tabulated. The ideal pressure at one micrometre is 1.300e-03 pascals; a finite plasma cutoff in gold already reduces it by a factor 0.920, a correction vastly larger than anything a milli-electronvolt-scale rearrangement could produce, because the modes that carry the force lie three to four orders of magnitude higher in energy. Laboratory vacuum forces therefore test the mode spectrum at electronvolt scales, not the surviving gravitational count. All values are computed from stated assumptions, not measured.