What Would It Take to Travel to a Parallel Universe?

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Traveling to a parallel universe remains purely speculative, as there is currently no scientific evidence supporting their existence. The discussion highlights the lack of a theoretical framework or technology that could facilitate such travel. While some may argue for the possibility of parallel universes, the consensus leans towards them being undetectable and outside the realm of science. The topic is more aligned with fantasy than any scientific reality. Overall, the conversation emphasizes the speculative nature of parallel universe travel without concrete scientific backing.
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I'm just curious, what would it really take to travel to a parallel Universe? How much energy and what kind of technology would enable a person to travel to other Universes?
 
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There is no evidence whatsoever that "parallel universes" exist, so your question in the realm of science fiction, not science.
 
Really, it's not even science fiction, it's straight fantasy.

There's no scientific basis for how we might do this; it is left to wild speculation.
 
I would relax the certainty against parallel universes, but, not the certainty they are intrinsically undetectable.
 

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?
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