Sorry. I should have searched for this question before asking it again. Don't know how to delete this thread.
That said, I have a question relating one of the answers, which is to distinguish between actual and virtual gravitons. Supposedly, virtual particles can travel faster than the speed...
If gravitons exist, how can black holes emit them? It cannot be like Hawking radiation, which increases as the black hole gets smaller. The gravitational field grows larger as black holes grow larger. Also, would not the energy of the graviton decrease to zero (and its wavelength increase to...
I am writing a science fiction book with the following premise:
A starship drive (and weapon) has been discovered that acts as a laser that turns ordinary matter into gamma rays at 100% efficiency; matter goes in one end of a tube and the light comes out the other end, driving the spaceship...