Universe Expansion: Is Merging Possible?

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The discussion centers on the idea of whether the universe's expansion could be an illusion caused by merging with another universe. While some participants speculate about the existence of multiple universes, they argue that the uniformity of cosmic expansion suggests no current interaction with another universe. There is a consensus that no scientific model supports the concept of merging universes leading to perceived expansion. Local variations in galaxy motion are acknowledged but are confined to our universe. Ultimately, the uniform expansion observed in all directions reinforces the notion that our universe is likely not merging with another.
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Is it possible that our universe is just one of more universes and that our universe just appears to be expanding because we are actually merging with another universe? Just wondering if it would be a plausible explanation. Maybe the pull from the other universe against the pull from ours makes is seen like an expansion. What do you real scientist think?
 
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Expansion appears to be quite uniform in all directions. If expansion/illusion of expansion is affected by another universe, there would have to be some mechanism that would cause that expansion to appear to be uniform.

I believe it is highly likely that there are many universes. However, because of the uniformity of the expansion, I am of the opinion that our universe is not currently interacting with another universe.
 
starligh98 said:
Is it possible that our universe is just one of more universes and that our universe just appears to be expanding because we are actually merging with another universe?
No. There is absolutely no model that would give anything looking like expansion from anything that could be called "merging of universes".

There are local differences in galaxy motion. But they are within our universe.
 
Okay. Is it possible that our observable universe is only a small part of a system that is swirling around it's own gravitational pull and that there are other systems that are doing the same? Are we able to see expansion in all directions? mfb, I'm not a scholar and I don't understand everything. I'm just curious, so if you could explain some of your answers, I would appreciate it. Thanks to you both for answering my questions.
 
have you seen this illustration of the OU?

http://upload.wikimedia.org/wikipedia/commons/b/b6/Earth%27s_Location_in_the_Universe_%28JPEG%29.jpg
 
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starligh98 said:
Okay. Is it possible that our observable universe is only a small part of a system that is swirling around it's own gravitational pull and that there are other systems that are doing the same?
What do you mean with "swirling around it's own gravitational pull"?

It is always possible that there are other universes without any connection to ours. And it is impossible to rule that out.

Are we able to see expansion in all directions?
Yes, and it is the same rate in all directions.
 

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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