Multi-Verse Theory Permits Retro-Time Travel Without Paradox

[RArvay]

If retro time travel is possible at all, then its reality must alter the entire paradigm upon which physics is founded, in ways that we cannot presently imagine.

The multi-verse theory offers a possible framework for time travel to the past, without the so-called grandfather paradox, but it also presents additional conundrums.

In some proposals, many new universes are continually produced from quantum branching (QB). QB is based on the idea that everything that can happen, must happen. According to QB, at each point in time, whenever two (or more) random results are possible, both of them may (or even must) occur, one in one universe, the other in a second universe. Each random event causes a branching of the universe into two (or more) resultant universes, all from the same “root” universe.

This results in an increasingly increasing number of new universes by so many orders of exponential magnitude that it is beyond computation.

The way in which this applies to time travel, in principle only, is that if one could somehow get to a past moment, his arrival there would instantly create a new, parallel universe, with a new fork in the road of time. Time, in that universe, would begin branching in that instant, so that the future in “our universe” is unchanged. The grandfather paradox is thereby avoided.

The time traveler from our universe simply disappears, never to reappear again in our reality, but instead to continue down a different road, so to speak. He can never again influence events in our universe, not even from our past.

This, however, creates the problem of conservation of mass-energy, since the disappearance of our time traveler reduces the amount of mass in our universe. Fine tuning could be impacted, not only in our universe, but in the “new universe” as well.

Another problem is that, if the present is continually branching into “many futures,” then there are an unimaginable number of “our future universes.” If that is so, then there should be an unimaginable number of possible time travelers from our future arriving at our moment in space-time, disrupting our fine tuning by significant degrees. That, apparently, has not happened.

These conundrums call into question, not only the fundamental possibility of retro time travel, but they also challenge both the multi-verse theory, and quantum randomness as presently theorized.

Therefore, we should dismiss the possibility of retro time travel, unless we are prepared to modify the entire paradigm upon which physics is founded, and to do so in ways that we cannot presently imagine.