Quote:
Originally Posted by GAHD
Time is but a function of matters entropy IMO. If you wanted to "travel back in time" you would have to literally reverse the entropy of every particle in the universe save those that make up yourself.
I don't think it's remotely possible.  |
True. IMO when some speak of time travel, they must be talking of super-relativistic motion; faster than light. There are some indications, with particles disappearing and appearing--tunneling, as well as non-locality, that such speeds are possible--although it is not widely accepted. Such theories would mainly hold truth for information, where we could cheat physical universe by sending information faster than light across the spacetime--at "relativistic" instant. So, in essence, one could send information into the future, relative to the motion of physicial universe.
But, to go into past is a different matter. First, all information already travels into past relative to now (everything that happened is left behind). Yet we have no idea that anyone is receiving it but us in now due to information storage capabilities. Second, irreversibility, as you say creates impossibility of past-travel. Third, one can stay in the past relative to the forward moving universe, but at the expense of matter--as in the black hole. Dense mass can stay at the bottom of the the gravity hole delayed or frozen in time relative to the rest of the universe. Lot's of problems with travels to the past.
