Top researchers in the field of gravitation present the stateoftheart topics outlined in this book ranging from the stability of rotating wormholes solutions supported by ghost scalar fields modified gravity applied to wormholes the study of novel semiclassical and nonlinear energy conditions to the applications of quantum effects and the superluminal version of the warp drive in modified spacetime. Based on Einsteins field equations this cuttingedge research area explores the more farfetc