time travel through parallell universes

S

smint

Temporal Novice
Ok, I have a theory...

If you travel back in time and manage it. Do you get to a parallell universe connected by a wormhole? If that is the case it must be possible to write off many common theories about time travel?
 
If you travel back in time and manage it. Do you get to a parallell universe connected by a wormhole?
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Hmm.....one can answer that with 'no'.

Travel 'back in time' is only really meaningfull in terms of our universe. Another universe has it's own time...so the idea of travelling 'back in time' to another universe really doesn't make any sense.
 
Yea, but I was thinking... If parallell universes exist. Maybe that's the only way to "time travel"?

Let's say we find a wormhole and enter it. We manage to travel back in time, but it's really only to a parallell universe, so we didnt travel in time for real.
 
If you travel back in time and manage it. Do you get to a parallell universe connected by a wormhole? If that is the case it must be possible to write off many common theories about time travel?
Click to expand...

Without getting too technical, yes. There are a set of solutions to general realtivity and the Schwartzschild metric that postulate wormholes that by definition connect to other universes. It's a system that has 5 parts:

2 universes
1 black hole in one universe
1 white hole in the other universe
1 wormhole that connects the black and white holes

The problem is that this is allowed in theory but begs the question as to whether it is just an artifact of the allowed math solutions that have no relationship to our reality. There's no observational evidence that wormholes exist in our universe anywhere and certainly not anywhere near enough to Earth to make any difference to us.

There are a host of other problems for a traversible wormhole (one that matter can flow through from end to end). The same math solutions also state that the wormhole is metastable. It is stable only in a complete vacuum - a universe devoid of any matter. As soon as any matter or photon enters a wormhole it pinches off, the two universes disconnect and the white hole becomes a black hole. In other words you end up with two universes that cannot communicate, two "ordinary" black holes and no wormhole.

Kip Thorne proposed exotic matter as a solution. Line the interior of the wormhole with exotic matter, which has a negative energy content, and it pushes the walls of the throat "outward" to avoid the pinch-off. That's all well and good but you have to insert the stuff into the interior of the throat and line it from end to end. I mean "you" literally. SOmeone or something has to enter the throat to deposit the exotic matter. That's normal matter that you are made of and the throat pinches off when you enter.

There's yet another problem. Unless you find a black hole in the other universe that is connected to a white hole in this universe by a wormhole it's a one-way trip to one specific place. It's not a car that can take any road and go anywhere. It's a train. One station connects to another station and no where else. It's a one-way trip because you can't enter a white hole from it's exterior. It repels matter rather than attracting matter. To get back you have to find another BH-WH-WH system that connects with this universe and hopefully somewhere in our neighborhood.

There is no easy solution here. If it could be done, even in theory, we're talking thousands of years of technological evolution to solve this one.
 
There's yet another problem. Unless you find a black hole in the other universe that is connected to a white hole in this universe by a wormhole it's a one-way trip. You can't enter a white hole from it's exterior. It repels matter rather than attracting matter.
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There is a worse problem. Because there is no 'known' repulsive force to power the white hole, one can only assume it is being powered by the gravity and energy of the black hole....and that is what ejects the material. However, if you take energy away from the black hole...especially ALL the energy, as would be the case with a corresponding white hole......then you would very quickly find your black hole evaporating to nothing.

Even if there was a corresponding repulsive force for the white hole, the transference of matter/energy from black hole to white would rob the black hole of its very reason for existence. If a white hole appears the minute a black hole forms.....that white hole is taking the very mass and energy that makes the black hole a black hole ! So in fact the black hole would form, transfer all it's mass and energy to a white hole...and then promptly disappear.

That's not quite what is observed.
 
Only if you meet your grandfather and kill him (or do anything else that might 'disturb the time-line'). In that case, though, you would not need a wormhole to get to the alternate universe (though of course wormholes can under certain circumstances act as time machines)--you by your act constructed it. 'Travel to alternative worlds' is merely a change in the phase of a 'matter-wave' (to paraphrase De Broglie). The question is, as always, how? The real question might actually be, how does one change one's consciousness in order to perceive the 'alternative reality', and how does one change the Universal Consciousness in order to be perceived in and/or by those in that 'alternative reality'.
 
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