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Multiverse Sanjaya Baral and Dhurba Chhetri St Multiverse Sanjaya Baral and Dhurba Chhetri St. Xavier’s College, Maitighar, Kathmandu, Nepal Abstract: Multiverse scenarios in cosmology assume that other universes exist "beyond" our own universe. They are an exciting challenge both for empirical and theoretical research as well as for philosophy of science. They could be necessary to understand why the big bang occurred, why (some of) the laws of nature and the values of certain physical constants are the way they are, and why there is an arrow of time. This essay clarifies competing notions of "universe" and "multiverse"; it proposes a classification of different multiverse types according to various aspects how the universes are or are not separated from each other; it reviews the main reasons for assuming the existence of other universes: empirical evidence, theoretical explanation, and philosophical arguments. Keywords: Big bang, universe, multiverse, cosmic inflation, time, quantum gravity, string theory, laws of nature, physical constants, fine- tuning, anthropic principle, philosophy of science, metaphysics, falsifications 1. INTRODUCTION include Stephen Hawking, Steven Weinberg, Brian The multiverse (or meta-universe) is the hypothetical Greene, Max Tegmark, Alan Guth, Andrei Linde, set of infinite or finite possible universes (including Michio Kaku, David Deutsch, Leonard Susskind, the universe we consistently experience) that Raj Pathria, Sean Carroll, Alex Vilenkin,Laura together comprise everything that exists: the Mersini-Houghton, and Neil deGrasse Tyson. In entirety of space, time, matter, and energy as well as contrast, critics such as Jim Baggott, David Gross, the physical laws and constants that describe them. Paul Steinhardt, George Ellis and Paul Davies have The various universes within the multiverse are argued that the multiverse question is philosophical sometimes called parallel universe or "alternative rather than scientific, that the multiverse cannot be universes" a scientific question because it lacks falsifiability, or even that the multiverse hypothesis is harmful or The structure of the multiverse, the nature of each pseudoscientific. universe within it and the relationships among the various constituent universes, depend on the specific multiverse hypothesis considered. Multiple universes have been hypothesized in cosmology, physics, astronomy, religion, philosophy, transpersonal psychology, and fiction, particularly in science fiction and fantasy. In these contexts, parallel universes are also called "alternative universes", "quantum universes", "interpenetrating dimensions", "parallel dimensions", "parallel worlds", "alternative realities", "alternative timelines", and "dimensional planes," 2. MULTIVERSE HYPOTHESES IN PHYSICS among others. The term 'multiverse' was coined in Swedish-American cosmologist Max Erik Tegmark, 1895 by the American philosopher and psychologist an American theoretical physicists and many other William James in a different context. physicists have hypothesized various classification schemes that categorize the various theoretical types The multiverse hypothesis is a source of debate of multiverse. Some of the prominent hypothesis are within the physics community. Physicists disagree discussed below: about whether the multiverse exists, and whether the 2.1 Max Tegmark's four levels hypothsis multiverse is a proper subject of scientific inquiry. Cosmologist Max Tegmark has provided a taxonomy Supporters of one of the multiverse hypotheses of universes beyond the familiar observable universe. 109 Sanjaya Baral ... Multiverse ... The levels according to Tegmark's classification quantum mechanics is that certain observations are arranged such that subsequent levels can be cannot be predicted absolutely. Instead, there is a understood to encompass and expand upon previous range of possible observations, each with a different levels, and they are briefly described below. probability. According to the MWI, each of these possible observations corresponds to a different 2.1.1 Level I: Beyond our cosmological horizon universe. Suppose a die is thrown that contains A generic prediction of chaotic inflation is an infinite six sides and that the numeric result of the throw ergodic universe, which, being infinite, must contain corresponds to a quantum mechanics observable. Hubble volumes realizing all initial conditions. All six possible ways the die can fall correspond to Accordingly, an infinite universe will contain an six different universes. Tegmark argues that a level infinite number of Hubble volumes, all having III multiverse does not contain more possibilities the same physical laws and physical constants. In in the Hubble volume than a level I-II multiverse. regard to configurations such as the distribution In effect, all the different "worlds" created by "splits" of matter, almost all will differ from our Hubble in a level III multiverse with the same physical volume. However, because there are infinitely many, constants can be found in some Hubble volume in far beyond the cosmological horizon, there will a level I multiverse. Tegmark writes that "The only eventually be Hubble volumes with similar, and difference between Level I and Level III is where your even identical, configurations. Tegmark estimates doppelgängers reside. In Level I they live elsewhere that an identical volume to ours should be about in good old three-dimensional space. In Level III 1010115 meters away from us. Given infinite space, they live on another quantum branch in infinite- there would, in fact, be an infinite number of Hubble dimensional Hilbert space." Similarly, all level II volumes identical to ours in the universe. This bubble universes with different physical constants follows directly from the cosmological principle, can in effect be found as "worlds" created by "splits" wherein it is assumed our Hubble volume is not at the moment of spontaneous symmetry breaking special or unique. in a level III multiverse. 2.1.2 Level II: Universes with different physical 2.1.4 Level IV: Ultimate ensemble constants The ultimate ensemble or mathematical universe In the chaotic inflation theory, a variant of the cosmic hypothesis is the hypothesis of Tegmark himself. inflation theory, the multiverse as a whole is stretching This level considers equally real all universes that can and will continue doing so forever, but some regions be described by different mathematical structures. of space stop stretching and form distinct bubbles, Tegmark writes that "abstract mathematics is so like gas pockets in a loaf of rising bread. Such general that any Theory Of Everything (TOE) that bubbles are embryonic level I multiverses. Linde and is definable in purely formal terms (independent of Vanchurin calculated the number of these universes vague human terminology) is also a mathematical to be on the scale of 101010,000,000. Different structure. For instance, a TOE involving a set of bubbles may experience different spontaneous different types of entities (denoted by words, say) symmetry breaking resulting in differentand relations between them (denoted by additional properties such as different physical constants. words) is nothing but what mathematicians call a set-theoretical model, and one can generally find a 2.1.3 Level III: Many-worlds interpretation of formal system that it is a model of." He argues this quantum mechanics "implies that any conceivable parallel universe theory Hugh Everett's many-worlds interpretation (MWI) can be described at Level IV" and "subsumes all other is one of several mainstream interpretations ensembles, therefore brings closure to the hierarchy of quantum mechanics. In brief, one aspect of of multiverses, and there cannot be say a Level V." 110 The Himalayan Physics, Vol.5, No.5, Nov 2014 Jürgen Schmidhuber, however, says the "set The simulated multiverse exists on complex of mathematical structures" is not even well- computer systems that simulate entire universes. defined, and admits only universe representations The ultimate multiverse contains every describable by constructive mathematics, that is, mathematically possible universe under different computer programs. He explicitly includes universe laws of physics. representations describable by non-halting programs 3. Multiverse hypotheses in philosophy and logic whose output bits converge after finite time, 3.1 Model realism although the convergence time itself may not be Possible worlds are a way of explaining probability, predictable by a halting program, due to Kurt Gödel's hypothetical statements and the like, and some limitations. He also explicitly discusses the more philosophers such as David Lewis believe that all restricted ensemble of quickly computable universes. possible worlds exist, and are just as real as the actual 2.2 Brian Greene's hypothesis world (a position known as modal realism). American theoretical physicist and string theorist 3.2 Trans-world identity Brian Greene discussed nine types of parallel A metaphysical issue that crops up in multiverse universes in his book “The Hidden Reality” schema that posit infinite identical copies of any given published on 2011. universe is that of the notion that there can be identical The quilted multiverse only works in an infinite objects in different possible worlds. According to universe. With an infinite amount of space, every the counterpart theory of David Lewis, the objects possible event will occur an infinite number of should be regarded as similar rather than identical. times. However, the
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