What is a parallel universe and how does it relate to physics?

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Parallel universes are a concept rooted in quantum physics and string theory, primarily associated with the 'many worlds' interpretation, which suggests all possible outcomes of quantum events occur. However, this idea lacks scientific merit due to its unconfirmability by known tests, making it largely speculative. The discussion emphasizes the importance of using reliable sources like Wikipedia for general overviews rather than relying solely on forums for broad questions. Participants express frustration over vague inquiries and encourage more specific questions for meaningful discourse. Overall, the concept of parallel universes remains contentious and poorly defined within the realm of physics.
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What is parallel universe?
 
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It is a nonsensical concept that has no basis in physics

EDIT: if you do not know how to use GOOGLE, you really should learn.
 
VaibhavP said:
What is parallel universe?

Physics Forums is a great place to answer specific questions, however if you wish to know the general overview of a subject then your best bet would be to hit up Wikipedia or another source of information. Imagine if someone kept asking you "What is X" when they had an encyclopedia right there next to them!
 
Parallel universes is a concept that originated in quantum physics, then reemerged in string theory. The basic idea is built on the 'many worlds' interpretation, where all possible outcomes of a quantum event must occur. The observational issue is we can confirm only a single outcome. That renders it unconfirmable by any known test, hence, it has little scientific merit.
 
friends first and second replies was expected...
the thing is, if I would have not know how to use google then probably I would have not physics forum and what parallel universe...so don't tell me that...anyway I was asking some specific things...
 
VaibhavP said:
friends first and second replies was expected...
the thing is, if I would have not know how to use google then probably I would have not physics forum and what parallel universe...so don't tell me that...anyway I was asking some specific things...

No you weren't. You asked nothing specific at all. Even your original question is too broad, as there are several possibilities on what you could be asking about. Searching for parallel universe on wikipedia brings up the following page: http://en.wikipedia.org/wiki/Parallel_universe

As you can see there are two options under Science and several in other areas. I recommend figuring out which one you are asking about and reading the relevant article on wiki.
 

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 'Hubble Constant, Dark Energy and the Expanding Universe'

Why was the Hubble constant assumed to be decreasing and slowing down (decelerating) the expansion rate of the Universe, while at the same time Dark Energy is presumably accelerating the expansion? And to thicken the plot. recent news from NASA indicates that the Hubble constant is now increasing. Can you clarify this enigma? Also., if the Hubble constant eventually decreases, why is there a lower limit to its value?
View full post »

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