Questions tagged [multiverse]

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Does multiverse theory obviate the need for fine tuning?

I recently read the book by Max Tegmark, The mathematical Universe, where he expounds upon the multiverse and how if ANYTHING can happen, will happen, because of all the ways things can be arranged. I ...
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Multiverse theory VS Conformal Cyclic Cosmology (CCC)

Multiverse theory describes that there are many singularities taking birth and then based on their properties (like dark matter content), these may pop in and out of existence. While on the other hand,...
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What does the standard claim that detecting a closed universe would rule out the multiverse mean?

The new article "Lorentzian Vacuum Transitions: Open or Closed Universes?" On page 41 reads: "We believe that the possibility that the geometry of the bubble after nucleation ...
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Are the different fields in multi-field inflation described by different Lagrangians?

The most simple models of cosmological inflation consider only one scalar field. However, there are more complex models (like hybrid inflation or multi-field inflation) which consider more than one ...
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Why can a “wave of differentiation” be thought of as a “sphere of differentiation”?

Below is a paragraph from chapter 11 of David Deutsch's book The Beginning of Infinity (emphasis mine). The context he is referring to is the quantum "multiverse" - his conjecture about how ...
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67 views

Different symmetries or no symmetries in string theory?

I was reading the book "A Fortunate Universe" by Geraint Lewis and Luke Barnes and something caught my attention: At page 195 the authors say that universes with different symmetries could ...
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1answer
29 views

In Eternal Inflation Theory, what is the average distance between bubble universes?

Patches of normal space randomly condense out of the false vacuum of inflating space. What is the average distance between these patches? Another words, what is the average number of bubble patches ...
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66 views

How Many Universes in Hawking's theory?

In Stephen-Hawking's theory, the explosion of a singularity (How would that be achieved?) would set time into reverse, returning to time, $t = 0$ (the origin of the Universe). How did this singularity ...
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3answers
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If there is an infinite number of universes doesn't that mean there is a universe where there is not an infinite number of parallel universes? [closed]

Hi i'm not clever enough to think outside of my finite existence. Can someone explain the bounds of my logical thinking that infinity is a paradox like the question: "are you lying?". Is my ...
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43 views

Surely there can't be other universes with different timelines if people have had proven micro time jumps and weren't disappearing or duplicated

The old age question about grandfather paradox where if somebody goes back in time and kills their grandpa, how can they exist? this was attempted to be answered by doing the crazy act in alternate ...
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1answer
56 views

Tegmark's level 1 universe: how many universes?

In "Our Mathematical Universe" Tegmark claims that inflation theory implies the existence of an infinite set of universes. My simple question is: what kind of infinity, and why that kind ? I ...
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Randomness in parallel universes [closed]

Suppose we have two completely identical universes (for instance in Tegmark's type III multiverse). In both of them, two identical men are sitting behind identical random number generators (RAN1 and ...
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Could the basic fundamental laws of physics change between universes in cosmological inflationary models?

According to cosmological inflationary models, different universes governed by different effective/low-energy laws of physics could exist, but the most fundamental laws of nature would remain the same....
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Is it possible that a black hole has a universe in itself? [duplicate]

Every black hole has a singularity. But the singularity is covered by a thing called 'Event horizon'or ' Schwarzchild Radius'. Our universe is originated from a naked singularity. By naked singularity,...
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30 views

Is there any model in theoretical physics combining Wheeler's “Principle of mutability” and multiverses?

Physicist John A Wheeler proposed the "Principle of mutability" which said that it could be the case that the universe would eventually shrink in a "Big Crunch" and the be re-born ...
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Theory of multiverse - it is really scientific theory? [closed]

In book Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos Brian Green shows that many current physical theories (e.g. quantum mechanics - many world interpretation of QM, superstring ...
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Does the Many worlds interpretation of quantum mechanics imply the existence of all conceivable worlds? [closed]

what I mean by this is, does every universe conceivable exist? would any universe i think of exist? could there be a universe of nothingness? are there universes of TV shows? are there universes with ...
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In the string theory multiverse, is every universe fated to collapse in a Big Crunch?

This is what I understand of the multiverse of the string landscape: the "laws of physics" reside in a 100-dimensional string landscape, which has ~$10^{500}$ minima. Each of the minima corresponds to ...
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1answer
50 views

Are the twentyish constants that have to fall in-between certain ranges to make conditions for live to exist necessary? [closed]

I have been listening to an audiobook about what we cannot know (although I have heard about 20 constants somewhere before that, just can't recall where) and in chapter 9, author talks about twenty ...
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85 views

The “Many Worlds” description of quantum mechamics and the “Multiverse”

I see a Phys.SE question, asking if the "Many Worlds" and the "Multiverse" ideas are essentially equivalent. This question was quickly squashed with a no answer. I would like to rephrase the question. ...
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1answer
113 views

Gravity in the multiverse

Consider Tegmark's multiverse theory, and single out a level. My question is: is each of the sub-universes endowed with gravity ? What about gravity between the sub-universes: does the multiverse ...
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82 views

Did Wheeler propose some kind of variation of MWI where universes would have different laws of physics?

John Wheeler proposed along with Hugh Everett and Bryce DeWitt the 'Many Worlds' Interpretation of Quantum Mechanics (although he expressed some doubts about its validity) I have read, from an ...
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1answer
147 views

Why is the measure problem an issue if the universe is always finite?

As a follow-up from this question, I was wondering how the measure problem applies to the idea of eternal inflation. First, why is it even a problem? As time progresses, more universes are created in ...
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Is it possible that the acceleration of the growth of our universe is driven by the overall gravitational pull of neighboring universes [closed]

I am painfully unequipped when I think about my my knowledge of physics. Still, I am enthralled, as many of us are, by the mysteries and complexity of the universe, both known and unknown. I was ...
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1answer
101 views

Multiverse and the anthropic principle? [closed]

In this paper (https://arxiv.org/abs/hep-th/0211048) by physicist Andrei Linde, the multiverse concept, the anthropic principle, quantum cosmology and inflationary cosmology are analyzed. In the ...
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Are there other theories (apart from string theory) that combined with inflation, would produce universes with different laws?

In chaotic inflation, space would stop expanding in some points, creating hubble volumes that could experience different spontaneous symmetry breaking, which would result in different properties, such ...
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Examples of theories that assume the existence of an “External Reality”?

In this paper written by physicist Max Tegmark (https://arxiv.org/pdf/0704.0646.pdf) it talks about "External Reality Hypothesis". Specifically, he says: Although many physicists subscribe to the ...
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742 views

Is the universe a closed system?

Most places say it is. But according to the multiverse hypothesis, gravitons and other quantum particles could travel from one universe to another. Wouldn't matter-energy then be transferred and thus ...
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Could micro-states not have equal probability as assumed? [closed]

How could micro-states have uniform distribution in a 3D space unless there was 0 Gravity? Gravity violates the assumption of equal probability as it makes matter move in a predictable direction. ...
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169 views

What are the laws of physics of the Multiverse ? What is the multiversal constant? [closed]

What are the laws of physics outside our Universe ? Can a Multiverse constant exist ? And what is the Multiverse constant if it exists ?
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1answer
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Tegmark's level 1 multiverse - why does infinite set of universes imply existence of a universe almost identical to ours?

In "Our Mathematical Universe" Tegmark claims that inflation theory implies existence of (countably, it seems to me) infinite set of universes. He says that from this follows existence of a universe ...
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2answers
95 views

Charge of multiverse

The charge of the universe is said to be zero. The most general argument I hear about this is that: since there was no net charge before the universe there must not be any after. Hence the universe is ...
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78 views

Could information in a boundary be modified once encoded in holographic principle?

There are models of universes where holographic principle has a different correspondence (there is absolutely no reason to assume that this would hold true for all possible universes. You could have a ...
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1answer
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Can holography be applied to every model?

Can all models have a holographic representation? I was talking with a physicist and he told me: "Holography is not a property you can just apply to any model of the universe willy-nilly. It either ...
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1answer
111 views

Have string theory and brane cosmology the same landscape?

Has any of these hypothetical theories a "higher" number of possible universes or has string theory landscape the same type of possible universes than brane cosmology?
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1answer
272 views

Heat death in eternal inflation

Heat death is the predicted fate of the universe. Eternal inflation theory states that new hydrogen atoms are created in each pocket universe so that means new hydrogen atoms are still being created ...
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3answers
631 views

How is the multiverse possible with the law of conservation of energy? [closed]

So I am not a physicist or have any background in physics but I enjoy thought experiments and thinking about the nature of our universe and I was thinking about the idea that we live in a multiverse ...
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2answers
354 views

Time and the Multiverse [closed]

Is a clock in one universe of any use to someone in a different universe? Supposing the multiverse model is correct, it posits the existence of several distinct universes that exist independently of ...
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1answer
174 views

If Hawking's last paper is correct, is it valid to assume that we live in a 5 dimensional universe?

If I understand Hawking's last paper, "A smooth exit from eternal inflation?" (2018-04-27), correctly it implies that the Big Bang generated more universes than our own. This means that to locate a ...
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118 views

What physical laws would need to change? [closed]

My fictional worlds reside in a multiverse. More specifically, they reside in a universe within that multiverse that is very similar to ours. But here are some big differences: White holes are in ...
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376 views

Is this interpretation of quantum fluctuation in eternal inflation in Wikipedia correct?

Wikipedia's article on inflation says Although new inflation is classically rolling down the potential, quantum fluctuations can sometimes lift it to previous levels. These regions in which the ...
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Does quantum fluctuation cause the inflaton value to increase in eternal inflation?

I would like to ask about slow-roll eternal inflation. Is it possible that the effects of quantum fluctuation can cause the inflaton value higher in some regions?
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1answer
232 views

Why can't white holes exist? [closed]

Why can't white holes exist? Also considering that there are infinite universes with infinite possibilities can there be a universe where white holes can exist and black holes cant, or maybe they can ...
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1answer
311 views

Do bubble universes in eternal inflation have edges?

I've been having a hard time understanding bubble universes in eternal inflation. So they are just finite regions of space where inflation has stopped and Hubble expansion has taken over? I just can't ...
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450 views

What phenomenon is Hawking radiation intended to explain?

I understand that science exists to make predictions, and that "unitarity" (the 100% total of the probabilities of all possible outcomes) is a major factor in the morale of scientists. However, in ...
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1answer
513 views

Does the Level I Multiverse theory violate the 2nd Law of Thermodynamics?

As far as I can understand, the Level I Multiverse theory is based on the idea of eternal inflation. It states that considering an eternally inflating and expanding universe, an infinite amount of ...
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1answer
756 views

Einstein-Rosen bridge through multiverse? [closed]

The Einstein-Rosen bridge describes a short cut between two point by "connecting" the two destinations in a folded 2-dimensional representation of the three dimensional universe, but if the universe ...
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38 views

Is it conceivable to have the Heisenberg uncertainty to take on a different value? [closed]

Would it be possible to conceive of a universe in which the maximal precision of measurement is greater or less than the current value? If so, what macroscopic effect would it have? Would it ...
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1answer
296 views

Correct my view of the multiverse?

First of all my apologies in case my understanding turns out to be wrong and idiotic. Being a layman in physics and cosmology, i have just started reading Brian Greene's book "The Hidden Reality&...
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Gravitational waves and Michio Kaku [closed]

I was reading a book from 2005 written by Michio Kaku (Parallel Worlds). In the book it is stated, that if gravitational waves should be detected, then that proves the multiverse theory. is there any ...