Could Other Universes Exist in a Multiverse?

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Discussion Overview

The discussion revolves around the concept of a multiverse and the possibility of other universes existing alongside our own. Participants explore various theories, implications of black holes, and the definitions of "universe" and "multiverse," while addressing the speculative nature of these ideas.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants speculate that multiple universes could exist, with ideas such as matter falling into black holes potentially leading to the creation of new universes.
  • Others argue that if these other universes cannot be detected, their existence is irrelevant, suggesting that some universes may be lifeless while others could harbor life.
  • A participant references David Deutsch's view that the effects of other universes may be measurable, though it would be prohibitively expensive to do so.
  • One participant challenges the notion that black holes could lead to other universes, citing a paper by Stephen Hawking which claims that information does not escape black holes, thus negating the possibility of "baby universes."
  • There is a contention regarding the definition of "universe," with some asserting that the term implies "everything," making the concept of a multiverse nonsensical.
  • Another participant expresses skepticism about the validity of multiverse theories, suggesting that cosmology is becoming more like a belief system rather than a science due to the speculative nature of current theories.
  • Some participants express disagreement with Hawking's views, suggesting that scientific progress often involves challenging established ideas, as exemplified by Einstein's relationship with Newton's theories.

Areas of Agreement / Disagreement

Participants express a range of views on the existence of other universes, with no consensus reached. Some support the multiverse concept, while others challenge its validity and the implications of black holes.

Contextual Notes

Participants highlight limitations in the current understanding of black holes and the multiverse, including unresolved definitions and the speculative nature of many claims. There is also mention of the evolving nature of scientific theories and the potential for future changes in understanding.

Critical_Pedagogy
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I was thinking this exact same thing, glad to see other people have the same idea as me.

http://en.wikipedia.org/wiki/Universe


Multiverse

"There is some speculation that multiple universes exist in a higher-level multiverse (also known as a megaverse), our Universe being one of those universes (lower case). For example, matter that falls into a black hole in our Universe could emerge as a "Big Bang," starting another universe. However, all such ideas are currently untestable and cannot be regarded as anything more than speculation."
 
Astronomy news on Phys.org
Well if it was not possible to detect these other universes, then they might as well not exist...but my opinion is that other universes do exist but some are completely lifeless though and some might actually have life on every other planet, some crazy random speculation here.
 
as David Deutsch has pointed out- it is not true that other universes are completely untesable and unreachable- it is just that it becomes exponentially EXPENSIVE to measure their effects-

basically this means that current notions define Reality as anything that can be observed within the limits of FUNDING (^__-)
 
Critical_Pedagogy said:
"For example, matter that falls into a black hole in our Universe could emerge as a 'Big Bang,' starting another universe."
I think this idea is outdated. In a recent paper on whether information can escape black holes (the conclusion was it can), Hawking stated:
There is no baby universe branching off, as I once thought. The information remains firmly in our universe. I'm sorry to disappoint science fiction fans, but if information is perserved, there is no possibility of using black holes to travel to other universes.
- http://arxiv.org/abs/hep-th/0507171
 
I don't get it. The word Universe literally means "everything." The definition of a multiverse is nonsence.
 
yeah, i believe in two different planes but one universe.
 
semantics

it said my message was too short, so this is just to make it longer
 
true. tomato.
 
Enos said:
true. tomato.
Exactly. You say "tomato"; I say "Lycopersicon esculentum L.". It's all good. :biggrin:
 
  • #10
Entropy said:
I don't get it. The word Universe literally means "everything." The definition of a multiverse is nonsence.

the word atom means indivisble and we all know that's not true. somethings just stick. multi-universes or a megaverse are just theories. most of which are very far-fetched. but there are still many people (me included) who believe in the possibility of parallel universes, white holes etc. and they're trying to prove it. cosmology now a days is kind of becoming a faith with all these new theories out there, no one knows wat to believe. we barely know the shape of our universe, let alone if there are any others like it...

btw, nice quote ellipse, i didnt know hawking said that.
 
  • #11
εllipse said:
In a recent paper on whether information can escape black holes (the conclusion was it can), Hawking stated:- There is no baby universe branching off, as I once thought. The information remains firmly in our universe. I'm sorry to disappoint science fiction fans, but if information is perserved, there is no possibility of using black holes to travel to other universes.http://arxiv.org/abs/hep-th/0507171

Who cares what Hawking thinks? Hawking is the John Kerry of science, flip-floppin all the time.

If Einstein listened to what Newton was saying, he would have never come up with Relativity.
 
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  • #12
Critical_Pedagogy said:
Who cares what Hawking thinks? I don't.

If Einstein listened to what Newton was saying, he would have never come up with Relativity.
Einstein didn't just ignore what his predecessors said; especially not Newton. Einstein realized that Maxwell's laws conflicted with Galilean mechanics, and he was bold enough to challenge Galilean mechanics based on his conviction that Maxwell's laws were more valid. But Einstein's first postulate for the special theory of relativity (the principle of relativity) is an expanded version of one that Galileo and Newton used.

And Hawking never said that there isn't a multiverse. He just stated that black holes cannot be used to travel between universes, and I think Hawking knows a tad more about black holes than you. Hawking pioneered the idea that black holes may create baby universes.

By the way, there have been some questions on the latest Hawking paper, and Hawking may even change his mind on this, but what he says is definitely not something to be ignored.
 

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