it is saidf that if you have a mass large enough, the gravity created by that mass is enough to warp space. Now people are saying that due to quantum mechanics the warping of space is viable, within a spacecraft for example. Does this require the spaceship to have some sorty of gravity generator ? producing gravitons and the such, or does it mean that conventional energy as we have it(electrical, chemical etc) can also be used to warp space ? thanks!