““REALITY OF ZERO-POINT ENERGY The uncertainty relation implies that there cannot be a region in space totally devoid of electromagnetic fields. They may well be absent on the average, but their energy fluctuations have to satisfy the uncertainty relation. We described the Casimir effect; it is nothing but a consequence of the inevitable fluctuations of the electromagnetic field. The fluctuations of zero-point energy are real and measurable, even if the zero-point energy itself is not.””
