Can you tell me about your opinion and reasoning on the concept of time being reversed?
If time were to run backward, there’s no way you could possibly know it. You couldn’t notice it or measure it, even in principle, so it’s questionable whether the notion of time running backward even has any meaning.
Time runs forward at a rate of what, 1 second per second? This is tautological; it’s necessarily the case. Let’s say time “stopped for a million years” (whatever that might mean), then resumed. You could never notice it, because all the apparatuses and thought processes by which you notice time passing would also have “stopped for a million years” and then resumed. (Let alone that this scenario implies some kind of meta-time, a time beyond time within which the passage of time happens, which there’s no reason to assume exists.)
Similarly, the passage of time couldn’t “slow down” or “run backward” in any meaningful sense. Think of time as like a video tape, say an episode of M*A*S*H. Time running in reverse would be analogous to playing the video tape in reverse. (Though unlike this thought experiment, more realistically there would be no world outside of the contents of the video tape in which we could view it in reverse, if we consider the universe to be analogous to the video tape.) Notice that all the characters in the video still do the exact same things; none of them notices somehow that time is actually running in reverse. No physical experiment they could run in the video could possibly detect that it’s being run in reverse; the information stored in the frames of the video would be the same regardless.
Though there is another possible consideration. What if time reversed in one area, then was viewed from another area in which time continued running forward? I.e., what if time were reversed relative to time not being reversed somewhere else (such as in Family Guy season 11 episode 4)? I think this would pose a few fundamental problems and paradoxes.
For one, time going backward in some area would imply that the processes within its atoms would be going backward, which I think would essentially make it antimatter (with respect to our matter), so if those atoms interacted at all with the forward-running atoms (as they necessarily would in the air at the border between the two regions), the result would be a huge explosion, converting all of the matter involved into energy—an amount of energy comparable to what’s released by a nuclear bomb.
For another, even not considering the matter-antimatter collisions, you wouldn’t actually be able to see any of what’s happening in the reversed-time area, because light wouldn’t emit/reflect outward from the objects in the area, but instead would fall inward toward them, then bounce off them and head toward the light source. That is, if there would be any reason for the light to just appear at the perimeter of the area in order to start falling toward the objects to begin with.
I guess you could say the light coming from outside the area would bounce off objects within the area and then come back to our eyes to see it, but really, it would just reverse direction as soon as it gets within the time-reversed area and go right back to outside the border, where it would reverse direction again and go back in, etc. etc. ad infinitum. Only really it wouldn’t repeat this process forward in time, half the process would be backward in time and half would be forward, so it overall it would just stay at the same time and accumulate more and more light infinitely..
And I suspect, again besides the matter-antimatter-collision problem, that there would be other serious causal paradoxes or contradictions, regarding the principles of action-reaction applied to the interaction of things within the time-reversed area and things outside of the area, such as air movement along the border if nothing else. But I’m not sure how to really think about those problems to illustrate them.