New idea for gravitational wave detector

The existing gravitational wave detectors, LIGO and Virgo, using long arms along which laser light travels to measure exquisitly small variations in length, are very expensive and complex devices. A new idea has been proposed to design a detector using the scattering effect on light photons of (still hypothetical) gravitons. This could potentially be a much cheaper, simpler device. If it worked it would also reveal a lot about gravitons and help to marry quantum physics and relativistic spacetime – an elusive but much pursued aim. It would also cast some light on th issue of whether gravitons are massless – moving at the speed of light, or have a small mass themselves and move slightly slower – the massive gravity theories. It would also have bearing on dark matter and dark energy.

Live Science article