文档介绍：arXiv:physics/9805028 v1 19 May 1998
ti eotesaeiei a,ohriei scurved. is it otherwise flat, if is - spacetime tensor the curvature zero is Riemann it by given is geometry geometry. the in spacetime shape changed different locally its a along has ac- move which worldline to is continues geodesic it body whether the since matter force-free celerated no a Such non-resistant force. is any motion to it move body subjecting a without making geodesic to body’s equivalent a is of which worldline shape spacetime the change of from geometry can follows we the locally, change It can frame we if example). reference that for here given surface, a Earth’s to ac- (the respect with moving a with to instance, resistance celeration no (for body offers a worldline body) case geodesic falling this a In along worldline. moving repre- geodesic is a motion spacetime by (inertial) If sented ve- non-resistant constant non-resistant. a a curved, is with is motion moving its is and moving body locity body the is a - spacetime inertia represents If by worldline worldline. straight body’s a free flat, a of shape the motion. body’s the in of results which geometry manipulation turn the local in of a itself, to instead body subjected propelled: is the spacetime be to can force body a to a applying how approach of new idea this radically the of exploration a The constitutes motion. of possibility state worldline