Suppose a gama ray transformed into a positrom and electron , both have a positive rest mas ,so space time is bend a little according to Aienstien . Suppose now electron and positron combined again into a gamma ray and rest mass disappear spontaniously. the space time becomes plannar again. The quation is how the gravitation wave behaves in what direction and speed gravitation wave move and whats happens to gravitons , that leave a body with rest mass and move back to a the same place but mass dissapears/