New laboratory tests of relativistic gravity using dipole waves

The most advanced gravity gradiometers and resonant transducers are now becoming capable of measuring dipole gravity waves produced by the most advanced periodic mass quadrupoles, like high-energy-density flywheels and teravolt-scale colliders. Laboratory tests of general relativity at relativistic speeds through measurements of dipole gravity waves in the source region are proposed.\footnote{F. Felber, http://arxiv.org/abs/1002.0351 (2010).} A NASA G2 flywheel module with a modified rotor can produce a post-Newtonian dc bias signal at a gradiometer up to 1 mE. At peak luminosity, the repulsive dipole impulses of proton bunches at the LHC can produce an rms velocity of a high-$Q$ transducer surface up to 4 $\mu $m/s at 31.6 MHz. The LHC test can be performed offline, without interfering with normal operations, and could provide the first evidence of repulsive gravity at relativistic speeds.