On separation of exchange terms for four-potential acoustic SH-wave case with dependence on gravitational parameters

One of major achievements in modern physics is investigations of complex systems consisting of mechanical, electrical, magnetic, gravitational, and cogravitational subsystems. The recently developed theory provides the coupling coefficient among these subsystems. It is called the coefficient of the electromagnetogravitocogravitomechanical coupling (CEMGCMC) . This coupling coefficient is one of the very important characteristics of a studied solid material and all the four-potential shear-horizontal acoustic waves depend on this coefficient. This report analytically studies the CEMGCMC concerning separation of several exchange terms. It is also discussed the possible propagation speeds such as the well-known speed of light in a vacuum for the purely electromagnetic wave and purely gravitational wave. However, some exchange mechanisms between the electromagnetic and gravitational subsystems can result in the existence of the other exchange speeds, with which generated signals representing neither purely electromagnetic nor purely gravitational waves can propagate in a vacuum with speeds several orders larger than the speed of light. The evaluated maximum value of this speed must be below ~ 10²⁷ m/s representing the speed with which a signal can cross for one second from one boundary of our Universe to the opposite. This can mean that such signals once generated inside of our Universe can instantly reach any other point in the Universe. It is also hoped that this theoretical work will contribute to the development of such new research discipline as the gravitational engineering.