Robin & Horace, > I think you will find that the ZPE cutoff frequency is about 10^43 Hz. Any number in the THz region is simply a limitation imposed by the hardware.
This may be a semantics problem. The Haisch Calphysics site mentions the recent work by Christian Beck at the University of London and Michael Mackey at McGill University suggesting that dark energy is nothing other than a subset of zero-point energy. He apparently agrees. Beck/Mackey propose that a phase transition occurs so that zero-point photons (virtual) below a frequency of about 1.7 THz are gravitationally active whereas above that they are not. They distinguish this as dark energy. I take this to mean that below the upper cutoff of 1.7 THz, which is a rather cold equivalent temperature - it will be possible, with a properly engineered device - to cohere that subset of ZPE - dark energy - which is a gravitationally active component of zero-point energy. Perhaps the evidence of a successful harnessing of this energy, in addition to the obvious: P-out > P-in is an apparent loss of mass during operation. The "loss" would only be transient however. Do you disagree with that interpretation of Beck/Mackey? Jones
