Hi Zach
Yes the idea of multiple universes is used to sidestep paradoxes. But still, one reality is gaining mass while others are loosing it.
What I never understood about the alternative realities theory -- what's to stop other realities stealing mass from ours. If we can open a back in time gateway to dimension X, why can't dimension X open a back in time gateway here. Then the same paradoxes can occur as a cyclic path is created.
The idea of alternative realities is that many are very similar to our own. So in those realities there will be people building time machines too.
So the result is that many of these realities will be connected with xomplex webs of portals that we and our alternate selves open. It inevitably would set up a paradoxical feedback loop somewhere.
Well, here's the deal in my mind. I think the notion of WHICH reality is "original" and which is (are?) "alternate" is, to borrow a phrase from Einstein, relative.
Clearly it seems reasonable to presume that, if alternate realities to ours exist, then OUR reality is, in turn, an alternate to those others. I don't so much believe in a "prime" universe with an infinate series of variations as I think it more likely to be a "multiverse" (assuming the entire concept is not just a load of nonsense) of which our own represents merely one aspect.
You could fairly ask what I base my reasoning on and I can only say it is an intuiitve deduction based on nothing more than gut instinct of what "feels" right. Not much to go on, I'll admit and not the LEAST bit scientific. Still, you gotta start somewhere and "suppose if . . . " is as valid as anything.
Yes, when you start moving mass between realities you take from one universe and add to another. What ARE the implications? Do you take from a universe and then ADD to your ORIGINAL universe or is it yet another alternate universe you add to? Does it matter? Is zero-point energy "leaking" in from other "realities" as part of some not understood process of nature?
I think what we enter into when we begin trying to unravel the secrets of time-travel and such is that we go beyond the confines of the natural universe and we begin to consider the implications of events and reactions that do not OCCUR in nature. Time is NOT a constant--Einstein demonstrated that quite well. Its flow can be effected in the sense that it can be speed of or slowed down relative to the observer, of course. But can it be reversed? Can one UN-explode a bomb? I don't mean in a practical sense, of course, but in theory. I believe the numbers for the math of the processes work in both directions but in terms of practicality, it's much easier to build a bomb and explode it than it would be to somehow devise means of capturing all the energy released by an explosion and sending back to point of origin.
As I said in another post, I have a sneaking suspiscion that "Time" is related somehow to the expansion of space and, perhaps the expansion of ALL that is contained within that space--you and me included. I don't know if you read that post or if you just concluded I was totally looney. But time and space are interelated--not my discovery, of course; space is expanding and time moves forward. So far, so good. Something bugs at me though when I think about the nature of time and how BOTH time AND space are impacted by strong gravitational fields. I have read that "time" to an outside observer may be perceived to have "stopped" at the event horizon of a black hole. One wonders where, relative to that same event horizon SPACE is no longer either expanding OR contracting and if this might be that same margin wherein "time" is perceived to have "halted". What might be the impications for an astronaut passing beyond the event horizon (never mind the tidal forces ripping his atoms to atoms) of a black hole it, in that area space is CONTRACTING and time is "reversed"? To the OUTSIDE observer, time ceases and the astronaut seems poised eternally on the margin of the event horizon while, for the astronaut, in theory at least, he should perceive time to continue apace relative to his environment. Whether this is true or not, we'll probably never know. I wonder if it might be more a case of one step forward, one step back at the edge of that event horizon. Outside, time moves forward, astonaut enters. Astronaut enters, time reverses, he exits. Outside, time move forward, astronaut enters. And so on and so forth throughout "eternity" like two frames of a movie flickering back and forth forever. The astronaut would probably NEVER know because when time reversed, to his perceptions, the entrance to the event horizon would have never happened and when he's outside, he hasn't entered yet. He might live til the end of the universe flickering back and forth between those two "instances" in time; an unknowing damnation of eternal life, trapped in one moment "forever".
Anyhow, nowI'm off into weirdness . . . Best to stop here.