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what is multiverse ?

 Early recorded examples of the idea of infinite worlds existed in the philosophy of Ancient Greek Atomism,  which proposed that infinite parallel worlds arose from the collision of atoms. In the third century BCE, the philosopher Chrysippus  suggested that the world eternally expired and regenerated, effectively suggesting the existence of multiple universes across time. The concept of multiple universes became more defined in the Middle Ages . 

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In Dublin in 1952, Erwin schrodinger gave a lecture in which he jocularly warned his audience that what he was about to say might "seem lunatic". He said that when his equations seemed to describe several different histories, these were "not alternatives, but all really happen simultaneously". This sort of duality is called "superposition ".

The American philosopher and psychologist William James  used the term "multiverse" in 1895, but in a different context. The term was first used in fiction and in its current physics context by Michael Moorcock  in his 1963 SF Adventures novella The Sundered Worlds (part of his Eternal champion series).

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Multiple universes have been hypothesized in cosmology , physics, religion , transpersonal , psychology , music , and all kinds of literature , particularly in science fiction , comic books and fantasy . In these contexts, parallel universes are also called "alternate universes", "quantum universes", "interpenetrating dimensions", "parallel universes", "parallel dimensions", "parallel worlds", "parallel realities", "quantum realities", "alternate realities", "alternate timelines ", "alternate dimensions" and "dimensional planes".

The physics community has debated the various multiverse theories over time. Prominent physicists are divided about whether any other universes exist outside of our own.

Some physicists say the multiverse is not a legitimate topic of scientific inquiry. Concerns have been raised about whether attempts to exempt the multiverse from experimental verification could erode public confidence in science and ultimately damage the study of fundamental physics. Some have argued that the multiverse is a  philosophical notion rather than a scientific hypothesis  because it cannot be empirically falsified . The ability to disprove a theory by means of scientific experiment is a critical criterion of the accepted scientific method . Paul Steinhardt  has famously argued that no experiment can rule out a theory if the theory provides for all possible outcomes.

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In 2007, Nobel laureate Steven Weinberg  suggested that if the multiverse existed, "the hope of finding a rational explanation for the precise values of quark masses and other constants of the standard model that we observe in our Big Bang is doomed, for their values would be an accident of the particular part of the multiverse in which we live."


Search for evidence 

Around 2010 scientists such as Stephen M. Feeney analyzed   Wilkinson Microwave Anisotropy Probe  (WMAP) data and claimed to find evidence suggesting that this universe collided with other (parallel) universes in the distant past. However, a more thorough analysis of data from the WMAP and from the Planck Satellite , which has a resolution three times higher than WMAP, did not reveal any statistically significant evidence of such a bubble universe  collision. In addition, there was no evidence of any gravitational pull of other universes on ours.

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