Multi-verse, metaverse, What is it exactly?

Multiverse, Meta-Universe? What is it Exactly? 

The multiverse (or meta-universe) is the hypothetical set of infinite 

or finite possible universes (including the historical universe we 

consistently experience) that together comprise everything that 

exists and can exist: the entirety of space, time, matter, and energy 

as well as the physical laws and constants that describe them. The 

term was coined in 1895 by the American philosopher and psychologist 

William James. The various universes within the multiverse are 

sometimes called parallel universes. 

Well there are many different theorys to explain that which we always 

here about this whole Multiverse thing. Now I come from an 

understanding of Dungeons and Dragons and the planescape Manual or 

back when I was first looking at it when I started at things, the 

Manual of the Planes. 

It was a book that gave all kinds of 

descriptions of classes and worlds, different areas and descriptions 

that worked within the DnD universe. Now many of you on here may have 

read the DragonLance books or ForgottenRealms. I personally Loved 

them. these were some of the worlds that were connected into the 

structure of DnD. But for the purposes of this article these were 

simply planes. they were worlds that connected to each other and DnD 

connected them through a staircase. Now this is common in folklore. 

Connecting worlds through various means bridges, stairs, trees or 

other means. Thinking of things as if they are layered. Because in 

may respects things are. Now theres a science to it. But in the 

roleplay world I want to explain first how different stories have 

come to understand it. 

Mount Olympus was the Home of the Gods of Greece and the Underworld 

was underground deep and held the souls of the damned but existed on 

another plane ruled by hades. Called the Elysian fields. 

In Norse religion, Asgard (Old Norse: ”Ásgarðr”; “Enclosure of the 

Æsir” is one of the Nine Worlds and home to the Æsir tribe of gods. 

It is surrounded by an incomplete wall attributed to a Hrimthurs 

riding the stallion Svaðilfari, according to Gylfaginning. Odin and 

his wife, Frigg, are the rulers of Asgard. 

One of Asgard’s well known locations is Valhalla, in which Odin 


The Cherokee revered the Great Spirit,simply referred to as Unelanuhi 

or “the Apportioner,” who presided over all things and created the 


Great Spirit is said to be omnipotent, omnipresent, and omniscient. 

Often called Apportioner and Creator, and was said to have made the 

earth to provide for her children. 

The Wahnenauhi Manuscript says that God is Unahlahnauhi, meaning 

“maker of all things” and Kalvlvtiahi, meaning “The one who lives 


The Cherokee held that signs, visions, dreams, and powers were all 

gifts of the spirits, and that their world was intertwined with and 

presided over by the spirit world. 

Note the word spirit world, as in a secondary world. 

Now I wont continue bring you listing every single religion belief 

system out there or historical account but throughout every type of 

belief we held some kind of belief in an alternate reality. Why is 

that? It is grounded in some real facts. These facts are what you 

base your roleplay on. With them you will be more accurate and it 

will come off more precise. Now are all these theories correct? 

I dont say they are. they are simply put theories on how it works. 

The idea of a multi or meta/megaversa is a concept that has been 

around for a long time… 

made very famous from movies like jet-li’s the one, and buckaroo 

banzai across the eight dimension. 

In any case some theorys that have been offered are: 

Max Tegmark’s four levels 

Cosmologist Max Tegmark has provided a taxonomy of universes beyond 

the familiar observable universe. The levels according to Tegmark’s 

classification are arranged such that subsequent levels can be 

understood to encompass and expand upon previous levels, and they are 

briefly described below 

A generic prediction of chaotic inflation is an infinite ergodic 

universe, which, being infinite, must contain Hubble volumes 

realizing all initial conditions. 

Accordingly, an infinite universe will contain an infinite number of 

Hubble volumes, all having the same physical laws and physical 

constants. In regard to configurations such as the distribution of 

matter, almost all will differ from our Hubble volume. However, 

because there are infinitely many, far beyond the cosmological 

horizon, there will eventually be Hubble volumes with similar, and 

even identical, configurations. Tegmark estimates that an identical 

volume to ours should be about 210118 meters away from us. Given 

infinite space, there would, in fact, be an infinite number of Hubble 

volumes identical to ours in the universe. This follows directly from 

the cosmological principle, wherein it is assumed our Hubble volume 

is not special or unique. 

Level II: Universes with different physical constants[edit] 

“Bubble universes”: every disk is a bubble universe (Universe 1 to 

Universe 6 are different bubbles; they have physical constants that 

are different from our universe); our universe is just one of the bubbles. 

In the chaotic inflation theory, a variant of the cosmic inflation 

theory, the multiverse as a whole is stretching and will continue 

doing so forever, but some regions of space stop stretching and form 

distinct bubbles, like gas pockets in a loaf of rising bread. Such 

bubbles are embryonic level I multiverses. Linde and Vanchurin 

calculated the number of these universes to be on the scale of 


Different bubbles may experience different spontaneous symmetry 

breaking resulting in different properties such as different physical 


This level also includes John Archibald Wheeler’s oscillatory 

universe theory and Lee Smolin’s fecund universes theory. 

Level III: Many-worlds interpretation of quantum mechanics 

Hugh Everett’s many-worlds interpretation (MWI) is one of several 

mainstream interpretations of quantum mechanics. In brief, one aspect 

of quantum mechanics is that certain observations cannot be predicted 

absolutely. Instead, there is a range of possible observations, each 

with a different probability. According to the MWI, each of these 

possible observations corresponds to a different universe. Suppose a 

die is thrown that contains six sides and that the numeric result of 

the throw corresponds to a quantum mechanics observable. All six 

possible ways the die can fall correspond to six different universes. 

(More correctly, in MWI there is only a single universe but after the 

“split” into “many worlds” these cannot in general interact.)[Tegmark 

argues that a level III multiverse does not contain more 

possibilities in the Hubble volume than a level I-II multiverse. In 

effect, all the different “worlds” created by “splits” in a level III 

multiverse with the same physical constants can be found in some 

Hubble volume in a level I multiverse. Tegmark writes that “The only 

difference between Level I and Level III is where your doppelgängers 

reside. In Level I they live elsewhere in good old three-dimensional 

space. In Level III they live on another quantum branch in infinite- 

dimensional Hilbert space.” Similarly, all level II bubble universes 

with different physical constants can in effect be found as “worlds” 

created by “splits” at the moment of spontaneous symmetry breaking in 

a level III multiverse. 

Related to the many-worlds idea are Richard Feynman’s multiple 

histories interpretation and H. Dieter Zeh’s many-minds 


Level IV: Ultimate Ensemble 

The ultimate ensemble or mathematical universe hypothesis is the 

hypothesis of Tegmark himself. This level considers equally real all 

universes that can be described by different mathematical structures. 

Tegmark writes that “abstract mathematics is so general that any 

Theory Of Everything (TOE) that is definable in purely formal terms 

(independent of vague human terminology) is also a mathematical 

structure. For instance, a TOE involving a set of different types of 

entities (denoted by words, say) and relations between them (denoted 

by additional words) is nothing but what mathematicians call a set- 

theoretical model, and one can generally find a formal system that it 

is a model of.” He argues this “implies that any conceivable parallel 

universe theory can be described at Level IV” and “subsumes all other 

ensembles, therefore brings closure to the hierarchy of multiverses, 

and there cannot be say a Level V.” 

Jürgen Schmidhuber, however, says the “set of mathematical 

structures” is not even well-defined, and admits only universe 

representations describable by constructive mathematics, that is, 

computer programs. He explicitly includes universe representations 

describable by non-halting programs whose output bits converge after 

finite time, although the convergence time itself may not be 

predictable by a halting program, due to Kurt Gödel’s limitations. He 

also explicitly discusses the more restricted ensemble of quickly 

computable universes. 

Brian Greene’s nine types 

American theoretical physicist and string theorist Brian Greene 

discussed nine types of parallel universes: 

The quilted multiverse works only in an infinite universe. With an 

infinite amount of space, every possible event will occur an infinite 

number of times. However, the speed of light prevents us from being 

aware of these other identical areas. 


The inflationary multiverse is composed of various pockets where 

inflation fields collapse and form new universes. 


The brane multiverse follows from M-theory and states that each 

universe is a 3-dimensional brane that exists with many others. 

Particles are bound to their respective branes except for gravity. 


The cyclic multiverse has multiple branes (each a universe) that 

collided, causing Big Bangs. The universes bounce back and pass 

through time, until they are pulled back together and again collide, 

destroying the old contents and creating them anew. 


The landscape multiverse relies on string theory’s Calabi–Yau shapes. 

Quantum fluctuations drop the shapes to a lower energy level, 

creating a pocket with a different set of laws from the surrounding 



The quantum multiverse creates a new universe when a diversion in 

events occurs, as in the many-worlds interpretation of quantum mechanics. 


The holographic multiverse is derived from the theory that the 

surface area of a space can simulate the volume of the region. 


The simulated multiverse exists on complex computer systems that simulate entire universes. 


The ultimate multiverse contains every mathematically possible universe under different laws of physics. 

Cyclic theories 
Main article: Cyclic model 
In several theories there is a series of infinite, self-sustaining 

cycles (for example: an eternity of Big Bang-Big crunches). 

See also: Introduction to M-theory, M-theory, Brane cosmology, and 

String theory landscape 
A multiverse of a somewhat different kind has been envisaged within 
string theory and its higher-dimensional extension, M-theory. 
These theories require the presence of 10 or 11 spacetime dimensions 
respectively. The extra 6 or 7 dimensions may either be compactified 
on a very small scale, or our universe may simply be localized on a 
dynamical (3+1)-dimensional object, a D-brane. This opens up the 
possibility that there are other branes which could support “other 
universes”. This is unlike the universes in the “quantum multiverse”, 
but both concepts can operate at the same time. 
Some scenarios postulate that our big bang was created, along with 
our universe, by the collision of two branes. 

Black-hole cosmology 
Main article: Black-hole cosmology 
A black-hole cosmology is a cosmological model in which the 
observable universe is the interior of a black hole existing as one 
of possibly many inside a larger universe. 

Anthropic principle 
Main article: Anthropic principle 
The concept of other universes has been proposed to explain how our 
Universe appears to be fine-tuned for conscious life as we experience 
it. If there were a large (possibly infinite) number of universes, 
each with possibly different physical laws (or different fundamental 
physical constants), some of these universes, even if very few, would 
have the combination of laws and fundamental parameters that are 
suitable for the development of matter, astronomical structures, 
elemental diversity, stars, and planets that can exist long enough 
for life to emerge and evolve. The weak anthropic principle could 
then be applied to conclude that we (as conscious beings) would only 
exist in one of those few universes that happened to be finely tuned, 
permitting the existence of life with developed consciousness. Thus, 
while the probability might be extremely small that any particular 
universe would have the requisite conditions for life (as we 
understand life) to emerge and evolve, this does not require 
intelligent design per the teleological argument as the only 
explanation for the conditions in the Universe that promote our 
existence in it. 

Search for evidence 
Physicists are currently searching for disk-like patterns in cosmic 
microwave background radiation which could provide evidence of 
collisions between other universes and ours. So far, analysis of data 
from the Wilkinson Microwave Anisotropy Probe (WMAP) has not revealed 
any evidence of a bubble universe collision. However, the WMAP is 
limited in the scale of bubble collisions it is capable of detecting. 
Future data from the Planck satellite, which has a resolution 3 times 
higher than WMAP and an order of magnitude greater sensitivity, can 
be used to more definitively test the bubble collision hypothesis. 
Recent research has indicated the possibility of the 
gravitational pull of other universes on ours. 

Claims of first evidence found 
Scientists say that they have found evidence that our universe 
collided with other (parallel) universes in the distant past. This 
claim emerged after studding of patterns in the cosmic microwave 
background radiation (CMB), the after-effects of the Big Bang, made 
by Planck space observatory operated by the European Space Agency 
(ESA), and designed to observe anisotropies of the cosmic microwave 
background (CMB) at microwave and infra-red frequencies, with high 
sensitivity and small angular resolution, in which they may have 
found evidence that four circular patterns recognized in the CMB are 
“cosmic bruises” where our universe has crashed into other universe 
(s) at least four times. 
A collision induces a temperature change in the CMB temperature map. 
The ‘blob’ associated with the collision is identified by a large 
needlet response, and the presence of an edge is determined by a 
large response from the edge detection algorithm. The findings are 
based on the complex theory of eternal inflation for our universe. 
This theory holds that our universe is only one bubble in a larger 
cosmos and that other universes, which will have different physics to 
our own, all exist at the same time. 

Non-scientific claims 
In his 2003 NY Times opinion piece, A Brief History of the 
Multiverse, author and cosmologist, Paul Davies, offers a variety of 
arguments that multiverse theories are non-scientific : 
For a start, how is the existence of the other universes to be 
tested? To be sure, all cosmologists accept that there are some 
regions of the universe that lie beyond the reach of our telescopes, 
but somewhere on the slippery slope between that and the idea that 
there are an infinite number of universes, credibility reaches a 
limit. As one slips down that slope, more and more must be accepted 
on faith, and less and less is open to scientific verification. 
Extreme multiverse explanations are therefore reminiscent of 
theological discussions. Indeed, invoking an infinity of unseen 
universes to explain the unusual features of the one we do see is 
just as ad hoc as invoking an unseen Creator. The multiverse theory 
may be dressed up in scientific language, but in essence it requires 
the same leap of faith. 
— Paul Davies, A Brief History of the Multiverse 
Taking cosmic inflation as a popular case in point, George Ellis, 
writing in August 2011, provides a balanced criticism of not only the 
science, but as he suggests, the scientific philosophy, by which 
multiverse theories are generally substantiated. He, like most 
cosmologists, accepts Tegmark’s level I “domains”, even though they 
lie far beyond the cosmological horizon. Likewise, the multiverse of 
cosmic inflation is said to exist very far away. It would be so far 
away, however, that it’s very unlikely any evidence of an early 
interaction will be found. He argues that for many theorists, the 
lack of empirical testability or falsifiability is not a major 
concern. “Many physicists who talk about the multiverse, especially 
advocates of the string landscape, do not care much about parallel 
universes per se. For them, objections to the multiverse as a concept 
are unimportant. Their theories live or die based on internal 
consistency and, one hopes, eventual laboratory testing.” Although he 
believes there’s little hope that will ever be possible, he grants 
that the theories on which the speculation is based, are not without 
scientific merit. He concludes that multiverse theory is a 
“productive research program”: 
As skeptical as I am, I think the contemplation of the multiverse is 
an excellent opportunity to reflect on the nature of science and on 
the ultimate nature of existence: why we are here… In looking at this 
concept, we need an open mind, though not too open. It is a delicate 
path to tread. Parallel universes may or may not exist; the case is 
unproved. We are going to have to live with that uncertainty. Nothing 
is wrong with scientifically based philosophical speculation, which 
is what multiverse proposals are. But we should name it for what it 
— George Ellis, Scientific American, Does the Multiverse Really 


On the other hand, as regards the criticism of lack of empirical 
testability or falsifiability, claims[citation needed] have been made 
that Laura Mersini-Houghton, a theoretical physicist, has developed 
(together with collaborators) a theory for the birth of the universe 
from the landscape multiverse that included four predictions proposed 
in 2006,[citation needed] two of which have since been observed: the 
Cold Spot (2007) and the deviation of the CMB Amplitude (2010). 
[citation needed] In 2007, Mersini-Houghton proposed that the 
observed CMB cold spot was “the unmistakable imprint of another 
universe beyond the edge of our own”,[28] just as she and her 
collaborators had predicted in their theory 8 months earlier. The 
validity and significance of these claims remains disputed, with 
several other possible causes being suggested for the Southern Cold 
Spot, and doubts being expressed about the existence of a Northern 
Cold Spot, and about the existence and velocity of Dark Flow, and so 

Again regarding the criticism of lack of empirical testability or 
falsifiability, speaking on BBC TV’s Science series Horizon’s ‘How 
Big is the Universe?’ program (first broadcast 27 August 2012), 
Professor Anthony Aguirre of University of California, Santa Cruz, 
stated that collisions between universes (which he described as 
‘bubbles’) in the eternal inflation version of the multiverse could 
leave behind evidence in the cosmic microwave background which should 
be detectable by the next generation of satellites. 

Occam’s razor 
See also: Kolmogorov complexity 
Critics argue that to postulate a practically infinite number of 
unobservable universes just to explain our own seems contrary to 
Occam’s razor. 
Max Tegmark answers: 

“A skeptic worries about all the information necessary to specify all 
those unseen worlds. But an entire ensemble is often much simpler 
than one of its members. This principle can be stated more formally 
using the notion of algorithmic information content. The algorithmic 
information content in a number is, roughly speaking, the length of 
the shortest computer program that will produce that number as 
output. For example, consider the set of all integers. Which is 
simpler, the whole set or just one number? Naively, you might think 
that a single number is simpler, but the entire set can be generated 
by quite a trivial computer program, whereas a single number can be 
hugely long. Therefore, the whole set is actually simpler. Similarly, 
the set of all solutions to Einstein’s field equations is simpler 
than a specific solution. The former is described by a few equations, 
whereas the latter requires the specification of vast amounts of 
initial data on some hypersurface. The lesson is that complexity 
increases when we restrict our attention to one particular element in 
an ensemble, thereby losing the symmetry and simplicity that were 
inherent in the totality of all the elements taken together. 
the higher-level multiverses are simpler. Going from our 
universe to the Level I multiverse eliminates the need to specify 
initial conditions, upgrading to Level II eliminates the need to 
specify physical constants, and the Level IV multiverse eliminates 
the need to specify anything at all.” 
He continues: 
“A common feature of all four multiverse levels is that the simplest 
and arguably most elegant theory involves parallel universes by 
default. To deny the existence of those universes, one needs to 
complicate the theory by adding experimentally unsupported processes 
and ad hoc postulates: finite space, wave function collapse and 
ontological asymmetry. Our judgment therefore comes down to which we 
find more wasteful and inelegant: many worlds or many words. Perhaps 
we will gradually get used to the weird ways of our cosmos and find 
its strangeness to be part of its charm.” 

Used various wikipedia articles for research, so I will cite them as a source.


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