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From Nordan Symposia
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[[Laura Mersini|Laura Mersini-Houghton]] claims that the [[WMAP cold spot#Parallel universe|WMAP cold spot]] may provide testable empirical evidence for a parallel universe within the multiverse. According to [[Max Tegmark]], (Scientific American, 2003, May, Parallel Universes) the existence of other universes is a direct implication of cosmological observations. Tegmark describes the set of related concepts which share the notion that there are universes beyond the familiar observable one, and goes on to provide a taxonomy of parallel universes organized by levels. (Parallel Universes [http://www.wintersteel.com/files/ShanaArticles/multiverse.pdf])
[[Laura Mersini|Laura Mersini-Houghton]] claims that the [[WMAP cold spot#Parallel universe|WMAP cold spot]] may provide testable empirical evidence for a parallel universe within the multiverse. According to [[Max Tegmark]], (Scientific American, 2003, May, Parallel Universes) the existence of other universes is a direct implication of cosmological observations. Tegmark describes the set of related concepts which share the notion that there are universes beyond the familiar observable one, and goes on to provide a taxonomy of parallel universes organized by levels. (Parallel Universes [http://www.wintersteel.com/files/ShanaArticles/multiverse.pdf])
===Classification===
===Classification===
In order to clarify terminology, [[George Ellis]], U. Kirchner and W. R. Stoeger recommend using the term "the Universe" for the theoretical model of the whole of the causally [[topology|connected]] [[spacetime]] in which we live, '''universe domain''' for the observable universe or a similar part of the same space-time, "universe" for a general space-time, either our own "Universe" or another one disconnected from our own, '''multiverse''' for a [[set]] of disconnected space-times, and '''multi-domain universe''' to refer to a model of the whole of a single connected space-time in the sense of [[chaotic inflation]] models.
In order to clarify terminology, [[George Ellis]], U. Kirchner and W. R. Stoeger recommend using the term "the Universe" for the theoretical model of the whole of the causally [[topology|connected]] [[spacetime]] in which we live, '''universe domain''' for the observable universe or a similar part of the same space-time, "universe" for a general space-time, either our own "Universe" or another one disconnected from our own, '''multiverse''' for a [[set]] of disconnected space-times, and '''multi-domain universe''' to refer to a model of the whole of a single connected space-time in the sense of [[chaotic inflation]] models.
