Warp Drive Question

[johndallman]

Originally Posted by davester65

Interesting, so negative mass may be needed to make it work. I'm not sure where I got the idea that an artificial gravity field would work. Maybe something I read about gravitational lensing, assuming that even means what I think it means. Or does that have to do with gravity bending light, not space itself? Or do they really know which is really being bent?

Gravity doesn't "bend space". Gravity is bent space, distorted by the presence of mass. Light's path is altered by passage through the bent space, and under some circumstances, this is detectable.