What is Multiverse: Definition and 198 Discussions

The multiverse is a hypothetical group of multiple universes. Together, these universes comprise everything that exists: the entirety of space, time, matter, energy, information, and the physical laws and constants that describe them. The different universes within the multiverse are called "parallel universes", "other universes", "alternate universes", or "many worlds".

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  1. T

    How many universes in multiverse?

    So, provided that the multiverse does in fact exist, are there an infinite number of universes in this multiverse or just a large amount? I've heard that the number is infinite and I've also heard the number is around 10^10^10^7. Also, if the number of universes is finite, how many universes...
  2. G

    MWI: What is the source of Deutsche's 'fungible' instances in the multiverse?

    Hi Just finished the chapter on the Multiverse in David Deutsche's excellent book The Beginning of Infinity. His explanation of how discrete values change from the multiverse perspective is brilliant. In it he explains that there is no such thing as a 'quantum jump' and that what 'changes'...
  3. L

    Exploring the Grand Design: The Multiverse & Buckyball Experiment

    Wow, I just became flooded in thought... Anyway, I recently read a Stephen Hawking book called the Grand Design, and I learned a lot! The book includes talk of multiple universes, and the buckyball experiment. I understood well but I have a question: I understand the theory that...
  4. D

    A bigger structure than multiverse

    Hi all, Recently there was a paper out by Susskind et. al on the topological phases of eternal inflation. We know of eternal inflation to populate our multiverse but in that paper Susskind talks about different kinds of eternal inflation, if one pays close attention to those words, does that...
  5. R

    Isn't M-theory and the multiverse idea a bit discouraging?

    I have been reading about the multiverse idea recently and when I came to think of it , as much as I find it extremely interesting, isn't it a bit discouraging as well? I mean, if there was "time" before the big bang and if there are infinite number of other "bubble" universes in the "11th...
  6. A

    Naive Multiverse Question: What Happens When Universes Collide?

    Please bear with me. I'm by no means well versed in these matters. I'm merely an interested layman. This question might not even make sense, but, if it doesn't, maybe someone could help me understand why. What I'm wondering is this. If we posit multiple universes -- not in the quantum sense...
  7. E

    Do infinite probabilities hurt multiverse theories?

    Do "infinite probabilities" hurt multiverse theories? I got some good responses to my last thread on here I thought I'd try one more. I'm wondering about the multiverse theories where whenever a quantum 'decision' is made, the universe branches out into versions of itself in which each of the...
  8. D

    Is there a theory that we are in an eternal loop? Multiverse?

    This is my first post and i must apologize for my extreme lack of knowledge of physics compared to your average poster here. I feel compelled to post here because about a year ago it suddenly occurred to me that we might be in an eternal loop and I would like to understand better whether is...
  9. G

    Does the Multiverse Theory Prove the Existence of God?

    The Multiverse argument is often invoked to abolish the need for divine providence. However, if there exist an infinite number of universes, one of which is ours with exactly the right parameters and physical laws for the formation of matter and emergence of life, wouldn't this inifinite number...
  10. tom.stoer

    LQG, LQC & the Multiverse Theory

    In LQC (which is something like a toy moidel for LQG) one can derive the so-called big bouce scenario. As far as I can see it is common belief that LQG will lead to something similar. But couldn't full LQG be a "matrix" for a multiverse theory, where - due to quantum fluctuations - baby...
  11. L

    Constants and multiverse possibilities

    Scientists have discovered that they are about 20 constants in nature that if they varied by more than 1% we would not exist. It's like the universe is finely tuned for life to exist. Now there's two possibilities, 1. the universe is intelligent, aware of itself,manages its evolution and plans...
  12. P

    Could someone clarify the Multiverse theory of things

    Hi, I guess the Multiverse theory may be the wrong wording but I was thinking about the ideas seen on Science programs and in fiction where a decision made in this universe spawns a set of alternate universes to cover all possible decisions. I am sure you've seen the sort of thing - Pilot...
  13. Ivan Seeking

    How many universes in a multiverse?

    http://www.physorg.com/news174921612.html http://arxiv.org/PS_cache/arxiv/pdf/0910/0910.1589v1.pdf
  14. O

    Choices in Multiverse: Do People Differ?

    Erm, so, I get that subatomic particles behave differently in different universes because they're random, but do people make different choices in different universes as well? Like, if there are some identical universes and I'm standing there deciding whether or not to eat a muffin, might I...
  15. O

    Multiverse Cosmology: Exploring Physicists' Views

    I really know nothing whatsoever about cosmology although I find it very interesting. It seems that a lot of physicists nowadays reckon there's a multiverse. I don't particularly want there to be a multiverse. WHAT DO YOU FOLKS THINK. Also, if there was a multiverse, would the laws of physics be...
  16. T

    How does MWI resolve low probability multiverse events?

    Is there some term for what I'm about to describe? I don't know if it's a philosophical or probability discussion or what. Take sports leagues, for example. So am I to believe that every permutation of MLB team records occur in that many number of parallel universes? I mean, what are the...
  17. Y

    Questions about Multiverse and beyond

    Somewhere I read Stephen Hawking’s words: “there is 98% chance that another Big Bang could happen and create another universe”. (meaning only) This makes the multiverse possible. When there is one, there is another one, naturally there should have unlimited number of universes exist and there...
  18. C

    Physics Forums in the multiverse

    When we discuss some topic here with other posters, you have limited information about them. You often don't know their real name, their age etc. etc. According to the MWI, this then means that the other people you are talking to exist as a superposition of all possible real persons. E.g...
  19. S

    Exploring the Possibilities of a Level IV Multiverse

    If there is a level IV multiverse, does that mean that my favorite comic book characters exist somewhere?
  20. T

    Quick question: Is the multiverse theorized to have an origin?

    Hi, I am just curious as to whether the "multiverse" predicted by M-theory (and other similar theories) is theorized to have an origin. Or is it envisaged as some sort of infinite membrane on which our universe and others like it are created but itself having no origin, cause or point of...
  21. R

    Ontological & topological issues wrt. the 'multiverse'

    Basic premiseses: Any universe can be expressed using a suitable topology containing points. At least the following (coherent) definitions exist for the multiverse (there can be more/others): 1. Topological disconnected universes Universes which could be very much the same as ours, and could...
  22. D

    Is the Multiverse a Revolving Landscape of Universes?

    If the multiverse exists as the scientists claim then do they revolve around each other? Can we ask which universe is at the center ? If not why ?
  23. B

    Exploring Max Tegmark's Multiverse: Quantum Suicide & Human Decisions

    I was reading and attempting to understand Max Tegmark's research on the multiverse, and I found this: http://science.howstuffworks.com/quantum-suicide.htm Now, while How Stuff Works is generally a good site, there are some areas that they could have been clearer on. The paragraph...
  24. wolram

    Exploring the Multiverse: A Brief Introduction

    http://arxiv.org/PS_cache/arxiv/pdf/0711/0711.4460v1.pdf This is only a couple of pages.
  25. H

    What theories appose a multiverse?

    Recently I saw a magazine which published an article on multiverse, where our universe is just one of the many possible universes resulted from inflation. That article claimed that the notion of a multiverse is gaining momentum. I am wondering if the view is shared by the majority of the...
  26. A

    Question about the multiverse and infinity

    I've wanted to ask this for a while since it has been confusing me for too long now... if our universe is infinite and nothing can possibly exist outside of it (other than a putative God although no one has an idea how that could be, since Kant proved quite a while ago that existence itself is...
  27. Chronos

    Exploring the Universe: Bostrom's Philosophy of Science & Hardy's Causaloids

    Defining what is/can be included in a description of what constitutes the universe is a frequent topic of interest. Most of us generally agree it consists of 'all that is possible', but have difficulty achieving a consensus on what is vs is not 'possible'. While I tend to steer clear of purely...
  28. marcus

    Universe or Multiverse? (new w/cosmic natural selection chapter)

    This is a new book from Cambridge University Press, scheduled to go on sale 30 June 2007, available now for pre-order https://www.amazon.com/dp/0521848415/?tag=pfamazon01-20 The Cambridge.org webpage for the book is here http://www.cambridge.org/catalogue/catalogue.asp?isbn=9780521848411...
  29. B

    Multiverse theory, where are they?

    if there are other universes according to the multiverse theory, where are these universes "located"? also, more importantly, does that imply that out universe is bounded (finite) because doesn't out universe have to end for another to begin? i know the idea behind string theory and the idea of...
  30. W

    Our universe should be called multiverse and not universe

    Actually our universe should be called multiverse and not universe! multi = many uni = one If the multiverse theory is correct, we would be one universe in about 10^500 other universe. This figure is vastly greater than the total amount of atoms in our universe! So if it's really...
  31. S

    Exploring the Multiverse: Can We Leave Our Universe and Enter Others?

    How can we say the universe is flat if it has depth? It may have very thin depth but it would mean that our universe is a rectangular cube, right? Also If we were to theoretically go in a spaceship towards the ends of our fast universe, what then? Will there be powerful particles to halt us...
  32. M

    Biran Greene @ The Edge: The Multiverse Hazard

    http://www.edge.org/q2006/q06_print.html#greene Brian Greene writes, "If true, the idea of a multiverse would be a Copernican revolution realized on a cosmic scale. It would be a rich and astounding upheaval, but one with potentially hazardous consequences. Beyond the inherent difficulty in...
  33. Garth

    The Multiverse: A New Perspective on Our Existence

    http://arxiv.org/PS_cache/hep-th/abs/0511/0511037 by Steven Weinberg My thoughts exactly - well I'm not so sure I'll bet the dog! Show me one and I'll believe you. Garth
  34. D

    Anthropic Multiverse Origin of Life

    "Quantum measurement by a self-replicating biomolecule was the key event that caused life to emerge." "Using the Many Worlds approach, peptide addition within the first (proto-) cell would have taken place, not in a classical universe, but within the multiverse of all possible states."...
  35. D

    The Anthropic Multiverse Origin of Life

    "Quantum measurement by a self-replicating biomolecule was the key event that caused life to emerge." Try to follow me on this: "Using the Many Worlds approach, peptide addition within the first (proto-) cell would have taken place, not in a classical universe, but within the multiverse...
  36. C

    Multiverse just passes the buck on

    Multiverse just passes the buck on... The idea of a Multiverse just passes the buck on to another order of magnitude of a cosmic scale. If we are simply one Universe of infinite Universes in a larger Multiverse, then why can't there be a 'Megaverse' that contains infinite 'Multiverses'...
  37. T

    String Theory: Multiverse w/ Same Constants?

    whenever I read an article about string theory stating that our Universe may be one of many making up a Multiverse, they always add, "each having different physical constants" Do they have to have different constants? Does the math require it? or could the constants be constant?
  38. M

    Signs of the Multiverse? Analyzing Unnatural Things

    I love the multi world theory and its limitless possibilities. I've given a lot of thought on it with some unnatural things that occur from time to time. How’s this for a brainstorming session of ideas? I feel we have a lot of signs that can perhaps help prove the multiple world theory. Maybe...
  39. marcus

    A scientific multiverse theory

    A theory is scientific if it bets its life on at least one prediction that it makes about the outcome of a doable experiment If a theory is part of science then there's a possibility it'll get shot down by an empirical observation---by some measurement----the theory makes predictions of so...
  40. R

    Are there infinite parallel universes with finely tuned properties?

    The universal constants are precisely balanced, such, that life could not exist otherwise. Now take those finely tuned constants out hundreds, thousands, millions, billions ...trillions of decimal places. Slight, almost infinitesimal differences between the constants of each universe, which...
  41. C

    Do M-Theory's 10^100 Universes Truly Exist?

    As I understand it, M-Theory predicts about 10^100 different possible universes and one of the main aims right now is to figure out the mechanism which selects our Universe out of all these possibilities. Does this mean that the other 10^100 universes are equally real and truly exist out there...
  42. V

    Multiverse Cosmological Models

    There is much confusion and mystery surrounding the Multiverse Theory. At present there is a wide range of different Multiverse Theories, which this paper does a good job in giving the basic concept behind the different variations Multiverse cosmological models
  43. J

    Time Travelling, Multiverse and the Paranormal

    Please tell me what do think about this article: http://www.zapfuture.com/modules.php?name=News&file=article&sid=7 Also, the project ZapFuture is just beginning. It is a 100% non-commercial site, and it aims to be completely community driven. So, if you people like to help, registering...
  44. M

    Who came up with the term 'multiverse'?

    Anyone know just who (and when?) came up with the term 'multiverse' to describe the parallel or multiple universe theories? thanks.
  45. C

    Time travel and Multiverse Theory

    I am curious as to others' beliefs/opinions on how time travel and/vs. multiverse theory correlate. Theory/Question 1. If you could go back in time and try to alter an event, could it turn out that you can't change it and are actually only helping history along it's course...
  46. N

    Multiverse Theory: Connections to Precognition & Deja Vu?

    How would multiverses be connected, I wonder about this in connection to precognition / dejavue. Is it possible that these could be leakage from alternate timelines (? whatever you want to call them). I have at times had instances what felt like memories but knew they were not only to have a...
  47. A

    Multiverse and life after death

    If indeed there are other universes out there, one for each and every possibility. Will there not be one that continues, where you took off?
  48. J

    Multiverse Theory: Is Our Universe Weird?

    In one of the multiverse theories I think that I am right in saying that there are an infinite number of universes created from each possible event. If this is so then surely extremely weird events must happen in some of the unvierses so why not ours?
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