I What's the source of energy for the universe's expasion?

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The discussion centers on the source of energy driving the universe's expansion, with a focus on "dark energy" as the primary factor behind its acceleration. Participants debate whether the expansion has a limit, with some asserting that it is merely residual motion from the universe's origin. The conversation emphasizes the importance of scientific evidence over personal speculation, highlighting the need for experimental validation in understanding cosmic phenomena. Ultimately, the thread concludes that imaginative theories do not hold weight without empirical support. The topic of the universe's expansion remains a complex and unresolved area in astrophysics.
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In case it's true that the universe is expading, what's the fuel for this expasion? I do not admit the idea that it's a case of spontaneous generation of space... so there must be a limit for this expasion. What's the limit for the expansion of the universe?
 
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The expansion is just leftover motion from the original universe I think you are talking about the ACCELERATION of the expansion. The source for that is what we call "dark energy" and if you figure out what that is, I guarantee you a Nobel prize. There is no limit.
 
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phinds said:
The expansion is just leftover motion from the original universe I think you are talking about the ACCELERATION of the expansion. The source for that is what we call "dark energy" and if you figure out what that is, I guarantee you a Nobel prize. There is no limit.

I think that energy would be demanded to make the universe expand even in constant motion, since I imagine space as something attached as glue to the other parts of space. I imagine that there is a counter-force that makes all parts of space stick together.
 
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You can imagine anything you like but this is a physics forum, not a personal speculation forum. Please read the rules.
 
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Put in another way, you can imagine anything you like, but the Universe is not under any obligation to work according to your imagination. This is why we do experiments - to figure out what works. Your imagination here does not.
 
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lordoftheselands said:
I think that energy would be demanded to make the universe expand even in constant motion, since I imagine space as something attached as glue to the other parts of space. I imagine that there is a counter-force that makes all parts of space stick together.
As @phinds has said, all of this is personal speculation, which is off limits here. Your title question has been answered.

Thread closed.
 
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##.
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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