Manipulation of gravitational waves for communications applications using superconductors

摘要

Previously published calculations claim that gravitational waves propagate inside superconductors with a phase velocity reduction of similar to 300 times and a wavenumber increase of similar to 300 times. Subsequent claims that this result is not credible appear to be either not tenable or not complete. This result has major consequences for the design of instruments to generate and detect gravitational waves, in particular high-frequency gravitational waves (HFGWs) having wavelengths on the same order as the dimensions of typical superconductive components. It is generally assumed that in free space the velocity of an HFGW is the smile as that of light and so the free space wavelength of an HFGW at 3 GHz will be similar to 10 cm. Inside a superconductor, the corresponding 3 GHz HFGW wavelength will therefore be similar to 300 mu m. The present paper will discuss the technical consequences of this surprising result. In particular, such a large mismatch in HFGW propagation impedance inevitably results in large Fresnel reflections from superconductor-air interfaces. This will cause a number of design problems in equipment proposed for HFGW generation and detection. For example, the superconductor thickness used in HFGW detectors will be critical. It may also be possible with care to exploit the result to obtain HFGW resonators and focusing reflectors. (c) 2005 Elsevier B.V. All rights reserved.