Dr. H.E. Puthoff (Institute for Advanced Studies at Austin) developed a theory of the quantum vacuum which treats certain characteristics of the vacuum, eg dielectric constant as polarizable. If so, many aspects of the spacetime metric are made more amenable to modification including lengths, frequencies, and possibly gravity itself. Hathaway posited that as one of the terms in the Puthoff development was a function of the rate of change of the electric field that one might be able to test the Puthoff Polarizable Vacuum theory using high-voltage pulsed power apparatus. HRI is currently designing such an experiment which involves hundred kilovolt picosecond pulses into special radiators (TEM horn antenna) utilizing custom-designed metamaterial lenses to determine if the properties of spacetime can be altered.