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Questions tagged [multiverse]

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1answer
66 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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1answer
63 views

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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2answers
75 views

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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0answers
50 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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1answer
95 views

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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1answer
69 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
47 views

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
83 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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0answers
73 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
67 views

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
73 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
162 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
168 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
230 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
158 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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0answers
101 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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3answers
289 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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1answer
148 views

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
195 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
234 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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2answers
420 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
389 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
566 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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0answers
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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2answers
220 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". Now ...
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1answer
114 views

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 ...
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2answers
499 views

Tegmark's Computable Universe Hypothesis &

Apart from the (well founded) critics to Tegmark's Mathematical Universe Hypothesis (https://arxiv.org/abs/0704.0646 ) I´d like to know how he justifies the assumption of the Computable Universe ...
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3answers
521 views

Does Level IV Multiverse/Ultimate Multiverse contains 'impossible worlds'? [closed]

Does Level IV Multiverse/Ultimate Multiverse contains 'impossible worlds'? Does it contain universes with sets, structures, or systems that exist beyond spacetime, duality, or existence and ...
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1answer
146 views

Are there really infinite alternatives? [duplicate]

The Multiverse theory says that there are infinite alternatives of our universe, many of them are very similar to the one were we live other are completely different. But the number of parallel ...
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3answers
352 views

Regardless of the multiverse. How are our constants and laws communicated across our universe, and my bathroom?

Assuming the multiverse theory is true, then each universe has a different set of constants and it provides a reasonable explanation as to why the constants in our universe seem set 'just right' for ...
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1answer
546 views

What type of thermodynamic system is the universe? [closed]

I was studying thermodynamics and came across a thought that Which type of system is the universe? Is it closed,open, or adiabatic(isolated)? Is it even a system ? Can it ever be a system? Assuming ...
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0answers
71 views

Energy of background radiation while falling into a black hole

As you fall into a black hole, the old story is you would be spaghettified - and this question is not about that. However passing of time would be warped, so you would see the future of the universe ...
2
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0answers
209 views

Criticism of physics in _The Beginning of Infinity_? [closed]

Have any criticisms been written of the physics presented in David Deutsch's book The Beginning of Infinity? Does he make any mistakes? If so, please refer me to them.
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1answer
89 views

What is the difference and/or similarity between multiple universes in inflation and in quantumphysics? [duplicate]

Some theories propose that there are more universes. In one of them it is said that there are parallel universes, due to inflations after the big bang that created them. But in the two-slit ...
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4answers
2k views

Does physics claim that every possible world has or will exist? [closed]

Has physics proven that every possible world has or will exist? Someone on-line, who actually seems fairly intelligent, but troll-ish, claims that there is good reasons for it, not from any ...
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0answers
182 views

Why is Weinberg's prediction of omega sub lambda ($\Omega_{\Lambda}$) other than sophisiticated tautology?

I am not a physicist, but I do have a background in engineering (EE and computer science) and have followed physics and cosmology on a primarily conceptual basis for many years. I have looked at ...
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1answer
371 views

Why do fundamental particles have charge? [duplicate]

More specifically, what is in the nature of these particles that they carry a charge, and thus repel objects of similar charge and attract those of opposite charge? Also, why would the charge of an ...
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0answers
210 views

Black Holes and the Multiverse [closed]

Are there any peer-reviewed theories which explore the idea that black holes in our universe may spawn other universes - or that our universe came from a black-hole-like event in another universe? ...
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0answers
925 views

If our universe is a “baby universe” [closed]

There are several theories that claim that our universe is simply a black hole in a "parent" universe: Stephen Hawking wrote a book called Black Holes and Baby Universes. Here he talks about black ...
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0answers
274 views

Multiple Intersecting Universes [closed]

I am not a relativist or cosmologist, so this is very qualitative: I imagine a pair of universes, where each has two spatial dimensions (plus time), embedded in a 3-D (plus time) space, and these ...
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0answers
62 views

Multiverse fictional constraints [closed]

In a multiverse the only thing that does not exist is fiction - true / false ? Specifically is anything fictional ever written (Star Wars, Harry Potter, Last and First Men etc etc) actually non ...
3
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1answer
177 views

Is a type I parallel Universe possible?

A type I parallel Universe (according to Max Tegmark) is a universe that is infinite and looks everywhere more or less like our universe does (it's homogeneous). Tegmark claims that within this ...
3
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1answer
291 views

Universe vs Multiverse. Time and Space

Wikipedia defines a multiverse as a hypothetical set of finite and infinite possible universes. Similarly, it defines the Universe is as "all of time and space and its contents". On the surface, ...
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2answers
1k views

Can multiple timelines exist according to theoretical physics? [closed]

Multiple timelines is not a reality yet (as of 2016's science and technology), but exists only in Marvel/DC universe. It is something that is used to explain the paradox of time-travel. If you go back ...
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1answer
133 views

Could our universe be destroyed within seconds? [closed]

I'm not that deep in physics. But some days ago I read, there could be different coexisting universes, which could even share "space" (or what ever it is) where each of them could have absolutely ...
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1answer
4k views

Stephen Hawking's theory of multiple universes [closed]

Is it correct to think that there are multiple universes? Does my thinking of having more than one big bang?
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1answer
145 views

How can bubble collision happen if there is no space and time outside the universe?

The question is almost self-explanatory. What I am trying to say is that if there are no space-time outside our universe, how does collisions even happen. I am having a hard time explaining this ...
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2answers
206 views

What laws are the same in all string theory compactifications?

In the string theory landscape, the set of particles we observe, their masses and interaction strengths originate from one of many different possible compactifications. What fundamental physical ...
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0answers
241 views

Are the fundamental constants of nature independent?

Background: I am a layman and I just watched the video "Infinite Worlds: A Journey through Parallel Universes" (http://www.youtube.com/watch?v=OO4uzgiRHkE) featuring a discussion with Andrei Linde, ...
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4answers
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Can a perfectly mathematically describable universe exist in a multiverse?

Assuming inter-universal (see here) travel is possible, can a perfectly mathematically describable universe exist inside a multiverse? If it could, would that mean that the multiverse is ...