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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", The New York Times George Ellis , writing in August 2011, provided a criticism of the multiverse, and pointed out that it is not a traditional scientific theory.
The quantum-mechanical "Schrödinger's cat" paradox according to the many-worlds interpretation.In this interpretation, every quantum event is a branch point; the cat is both alive and dead, even before the box is opened, but the "alive" and "dead" cats are in different branches of the multiverse, both of which are equally real, but which do not interact with each other.
Every experiment that brings better credence to inflationary theory brings us much closer to hints that the multiverse is real." [21] In 2018 the late Stephen Hawking and Thomas Hertog published a paper in which the need for an infinite multiverse vanishes as Hawking says their theory gives universes which are "reasonably smooth and globally ...
These experiments have shown that the one part in 100,000 inhomogeneities observed have exactly the form predicted by theory. There is evidence for a slight deviation from scale invariance. The spectral index, n s is one for a scale-invariant Harrison–Zel'dovich spectrum. The simplest inflation models predict that n s is between 0.92 and 0.98 .
Although there is no evidence for the existence of a multiverse, some versions of the theory make predictions of which some researchers studying M-theory and gravity leaks hope to see some evidence soon. [32] According to Laura Mersini-Houghton, the WMAP cold spot could provide testable empirical evidence of a parallel universe. [33]
Laura Mersini-Houghton (née Mersini) is an Albanian-American cosmologist and theoretical physicist, and professor at the University of North Carolina at Chapel Hill.She is a proponent of the multiverse hypothesis and the author of a theory for the origin of the universe that holds that our universe is one of many selected by quantum gravitational dynamics of matter and energy.
In 2013, data from the Planck space telescope showed no evidence of "dark flow" on that sort of scale, discounting the claims of evidence for either gravitational effects reaching beyond the visible universe or existence of a multiverse. [5]
One of the earliest documented attempts to apply brane cosmology as part of a conceptual theory is dated to 1983. [ 5 ] The authors discussed the possibility that the Universe has ( 3 + N ) + 1 {\displaystyle (3+N)+1} dimensions, but ordinary particles are confined in a potential well which is narrow along N {\displaystyle N} spatial directions ...