Hello, So, I'm writing sci-fi and I'm "doing my homework" to make this thing a pleasant read to those in the know, and my own standards demand I make this as possible as... Possible. So what's the best shot at an FTL-capable vessel, that's practical in a century? (i.e, not wormholes or Alcubierre drive which require astronomical amounts of energy and/or mass) First I was looking at a paper by H. David Froning describing rotation into higher dimensional space by use of (to the best of my memory) "conditioned electromagnetic radiation coupled with the forces behind mass and inertia", which would polarize the vacuum around the spacecraft (I believe it meant by effecting virtual particles?) as to increase vacuum permeability/decrease resistance to acceleration and increase the local speed of light in the polarized space. I believe this linked page describes it. The only issue was the original paper stated it required enormous amounts of energy. Exactly what kind of amounts of energy would be good to know... Heim theory is another idea I've been looking at. I've read the wiki page, and it doesn't look good for Heim theory right now, but perhaps something that could make a comeback this century. What would FTL travel according to Heim Theory entail?