Is there a chronology in the multiverse?

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Discussion Overview

The discussion revolves around the concept of chronology within the multiverse framework, particularly focusing on the implications of progenitor and progeny universes. Participants explore whether a chronology exists outside the spacetime continuum of individual bubble universes and the nature of time in relation to these universes.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant suggests that if our universe originated from a progenitor universe, it implies a chronology that exists outside our own spacetime continuum.
  • Another participant agrees that each universe has its own spacetime, raising questions about the relative nature of time for observers within different universes.
  • Concerns are raised about the concept of infinite regress in the multiverse, questioning whether an infinite number of bubble universes precede our own and if time can be discussed outside of these bubbles.
  • A participant expresses confusion regarding the relationship between the idea of a universe arising from "nothing" and the notion of bubble universes, suggesting a contradiction in these concepts.
  • One participant notes that discussions about the multiverse often lead to speculation, as such phenomena are not currently observable.
  • Another participant references eternal inflation as a justification for the multiverse and cites conflicting papers that dispute the existence of a first "pocket universe."
  • There is a sentiment that even potential future experimental evidence may not resolve the ongoing controversies surrounding the multiverse concept.

Areas of Agreement / Disagreement

Participants express differing views on the existence and nature of chronology in the multiverse, with no consensus reached on the implications of progenitor and progeny universes or the concept of time outside bubble universes.

Contextual Notes

Limitations include the speculative nature of discussions regarding the multiverse and the lack of observational evidence to support or refute claims about the chronology of universes.

JC_CAN
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Chronology in the multiverse...

One version of the multiverse suggests that our bubble universe came from a progenitor universe and that our universe itself may have spawned progeny universes. Does this not imply a chronology outside of the spacetime continuum of our bubble universe?

Please help me here because I understand time to exist only back to the singularity that created our universe. But, if there were a progenitor universe, would it not have its own space-time continuum that existed "before" ours?

It seems to me that our concept of time applies only from within our universe and that an infinite continuum is needed to describe the chronology of bubble universes.
 
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Yes, of course! Each "universe" has its own "space-time".
 
Thank you HallsofIvy,

So each "universe" has its own "space-time", which means that our sense of time is relative to observers within our universe. The question then is about the chronology of multiple "universes" from parent universe to daughter universe. Is it not an infinite regress? An infinite number of bubble universes came before ours and our universe will spawn an infinite number of new universes? Can we even talk about time outside of a bubble universe?

Also, I quite enjoyed the book "A Universe from Nothing" by Lawrence Krauss, but I struggled with the idea because it seems inconsistent with the "bubble" universes that physicists like Michio Kaku describe. One bubble giving rise to the next seems not to be from "nothing" but from "everything"! Our universe may have a total energy of zero, but if spawned from a progenitor universe, then it can hardly be considered a universe from nothing.
 
JC_CAN said:
So each "universe" has its own "space-time", which means that our sense of time is relative to observers within our universe. The question then is about the chronology of multiple "universes" from parent universe to daughter universe. Is it not an infinite regress? An infinite number of bubble universes came before ours and our universe will spawn an infinite number of new universes? Can we even talk about time outside of a bubble universe?

We don't know. Such things are not observable, and any answer would be pure speculation.
 
What multiverse?
 
Eternal inflation is the main justification for a multiverse in comsology.
According to this paper there is a first "pocket universe"
http://arxiv.org/abs/grqc/0110012
However others dispute this;
http://arxiv.org/abs/1205.0589
is one example.

I hope that one day we will learn if the multiverse exists or not. But I am not holding my breath. Even if one day there is some experimental evidence to go over, I very much doubt it will resolve the above controversey.
 

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