Claims that we have discovered all relevant laws of physics are absurd on their face.
I certainly do not claim to know all the laws of physics, space/time, spatial mechanics, etc. necessary to calculate time travel. I just think, logically, that it would be nigh impossible for a human to do it. And, with the state of quantum mechanics, *IF* it is possible, it would require a computer much faster than anything we have at this time. Now, is it possible in the future to have a computer capable of doing it? I don’t know.
Clioman -
I seem to recall reading a sci-fi story about the discovery of the true origins of meteorites: time travelers who had gone into the future, only to learn that the Earth hadn’t arrived there yet...
That would be a very inventive story!
Physics folks have many different theories as to how time travel might work—even for humans.
All of them involve major changes in our views of physics—so it makes no sense to dismiss them just because current physics does not allow it.
I am not persuaded by any of them—to be honest—but as I say we don’t know what we don’t know.