Why Can't We See a Parallel Universe?

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The concept of parallel universes remains unproven and largely theoretical, originating from Hugh Everett III's work. Current scientific methods do not allow for the detection or measurement of these hypothetical universes, making their existence speculative. The idea was proposed to address peculiarities in quantum mechanics, yet no observations have been identified that necessitate a parallel universe for explanation. As it stands, the lack of empirical evidence leaves the notion of parallel universes unverified. The discussion emphasizes the need for observable phenomena that would support the existence of such universes.
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a parallel universe?
 
Space news on Phys.org
Parallel Universes ain't even been proved. It was Hugh Everett III who came up with the Idea that they exist. But it's something we cannot prove, we can't see, sense, touch, take a temperature reading or anything like that to prove it's existence. I believe he came up with the idea to solve why quantum matter behaves like it does.
 
Observations that require a parallel universe to explain are needed. No such observations are yet known to exist.
 
Chronos said:
Observations that require a parallel universe to explain are needed. No such observations are yet known to exist.
http://arxiv.org/abs/0809.4422
 

Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
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Thread 'Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".'

The formal paper is here. The Rutgers University news has published a story about an image being closely examined at their New Brunswick campus. Here is an excerpt: Computer modeling of the gravitational lens by Keeton and Eid showed that the four visible foreground galaxies causing the gravitational bending couldn’t explain the details of the five-image pattern. Only with the addition of a large, invisible mass, in this case, a dark matter halo, could the model match the observations...
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Thread 'Big Bang and Infinite Universe'

Hi, I’m pretty new to cosmology and I’m trying to get my head around the Big Bang and the potential infinite extent of the universe as a whole. There’s lots of misleading info out there but this forum and a few others have helped me and I just wanted to check I have the right idea. The Big Bang was the creation of space and time. At this instant t=0 space was infinite in size but the scale factor was zero. I’m picturing it (hopefully correctly) like an excel spreadsheet with infinite...
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