[saberdancer]

Thank you for the answer. I am humbled. I have decent understanding of Newtonian physics, but when it goes to relativistic levels I am out of my depth.

Fascinating stuff. So effectively, with "infinite energy" and "unbreakable materials" we could have artificial gravity.

[ars]

Artificial gravity implies you could turn it on and off. But you can't - if you have infinite energy, you also have infinite gravity, the two are bound together.

Whenever you have energy, you have gravity. I suppose you could send the energy from elsewhere, then send it back when you don't want the gravity anymore.