Discussion to the Study of Gravity Propagation Speed

The speed of gravity in Newton's universal law is infinite,but the gravity propagation speed in Einstein's theory is the speed of light.General relativity(GR) explains these features by suggesting that gravitation(unlike electromagnetic forces) is a pure geometric effect of curved space-time,not a force of nature that propagates.Moreover,now different gravity models need to be considered.For example,if gravity is once again taken to be a propagating force of nature in flat spacetime with the propagation speed indicated by observational evidence and experiments: not less than 2×1010c(c is the speed of light in vacuum).Although faster-than-light force propagation speeds do violate Einstein's Special relativity(SR),they are in accord with Lorentzian relativity(LR).Gravity plays a crucial role at these speeds and this should be a concern to the propulsion dynamicist.Recently,space-technology calls for experimental physicists to find new signal sources,which can propagate with speed greater than that of light.The possibility that gravity may propagate faster-than-light encourages scientists to conduct new experiments and studies.