I'm interested in reading about the fundamental limits imposed by known physics on distorting spacetime in ways that bring two masses closer together so that speed of light travel time between them is reduced. I'm familiar with the concept of inflation theory. I think of it as a rapid stretching of spacetime so that the space/distance separating all masses in the universe was rapidly increased. Masses initially in close contact and thermal equilibrium were separated by inflation such that after 13+ billion years of light travel, light from objects in opposite directions from us is just now arriving at the earth. One wonders if inflation is one way time directed or can it operate in reverse within the limits of known physics to bring objects closer together. I'm familiar with the curvature of spacetime in general relativity, which leaves me wondering how much spacetime can be stretched or compressed to change the amount of spacetime separating two objects. I'm passingly familiar with idea of the Alcubierre drive, but I'm not so much interested in space travel as in reading about the limits imposed by known physical laws that might allow inflation to run in reverse, or two objects to become closer, even where it's not even theoretically practical for use as a space drive. Thanks for any recommended links or books I might be able to review that would give me some insight.