Question on parallel multi. theories

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    Parallel Theories
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Discussion Overview

The discussion revolves around the concept of parallel universes and the implications of infinite universes, particularly focusing on the possibility of traveling between these universes. Participants explore theoretical frameworks related to string theory and the nature of outcomes in an infinite multiverse.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions why, if there are infinite universes where every possible outcome occurs, there hasn't been a way to travel between them.
  • Another participant agrees that if infinite universes exist, there should be infinite scenarios where such travel is possible, but humorously suggests that "infinite" might not be strictly accurate.
  • A different participant argues that even with infinite universes, certain events, like traveling between them, could be impossible due to the laws of physics being consistent across all universes.
  • One participant emphasizes that the premise of infinite universes does not guarantee that all outcomes are possible, suggesting that the concept of probability plays a significant role in understanding these scenarios.

Areas of Agreement / Disagreement

Participants express differing views on the implications of infinite universes, with some suggesting that travel between universes should be possible, while others argue that physical laws may prohibit such events. The discussion remains unresolved, with no consensus on the feasibility of inter-universal travel.

Contextual Notes

Participants acknowledge the complexity of the topic, particularly regarding the definitions of "infinite" and "possible outcomes," as well as the role of probability in these discussions. There is an indication that assumptions about the nature of universes and their laws may not be fully explored.

rpcarroll
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Ok, I haven't studied the subject at all (yet), but a professor of mine was explaining some of the theories behind string, brane, etc. to me. So bear with me here; I'm confused by this idea that came into my head earlier:
If there are an infinite number of universes where every possible outcome has happened someplace in one of them... shouldn't something in one of them have found a way to travel between other parallel universes and into ours?
 
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Hi, n00b here too, just looking around.

Surely if there are infinite 'verses then technically there are infinite universes where that is possible, and even infinite universes where it has happened! :confused:

Maybe when they say 'infinite' they actually mean slightly less than infinite? :biggrin:
 
There can be impossible events even if there are infinite universes. For example, 1+1 = 2 in all universes. Similarly, it could and probably is the case that in every universe, travel to other universes is prohibited by the laws of physics.
 
rpcarroll said:
If there are an infinite number of universes where every possible outcome has happened someplace in one of them... shouldn't something in one of them have found a way to travel between other parallel universes and into ours?
Only if such a thing is a "possible outcome".


Incidentally, I'm accepting the premise is true only for the sake of argument. Really, I think your professor is just outlining some of the counterintuitive facts about probability when infinitely many samples are involved. And incidentally, I think he should have said "has happened with probability 1" rather than "has happened" -- probability 1 isn't the same thing as a guarantee!
 
Hi rpcarroll,

Too bad you're not in one of the universes where you ignore this part of your professor's lecture. However, maybe this is one of the universes in which it isn't on the exam anyway.
 

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