If theres matter in the universe

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The discussion centers on the philosophical question of whether the universe exists if there are no observers to witness it. It argues that the existence of matter implies the universe's existence, as the premise relies on the universe being present. The conversation highlights the tautological nature of the question and suggests that perceptions of reality do not affect the existence of objects. Different interpretations of "universe" are explored, emphasizing personal experiences versus the broader cosmic context. Ultimately, the question reflects a classic philosophical dilemma akin to the "tree falling in the forest" scenario.
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And no life is around to witness it, does the universe exist?
 
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If there is matter in the universe it must necessarily exist, since the premise that there is matter in the universe can only be satisfied if the universe itself is there. This is somewhat tautological, and the answer is based on an interpretation of the term "existence" as synonymous with "to be".

That being said, one could state that the universe didn't exist, and given the absence of observers, no observation suggesting otherwise could be made.

I guess it amounts to deciding whether there is matter in the universe, though this of course cannot be done in the absence of observers ("life") either. It seems this makes the question a bit even more hypothetical than at first glance.
 
Yes.


The universe is an object.
Objects exist whether or not they are observed.
Therefore, our perceptions of the universe have no bearing on its existence.

I don't see how one can make an argument in the positive without resorting to relativistic notions of reality. (Not to be confused with relativity :D)
 
I agree, that the question is a little flawed. But it's also perfectly reasonable. Flawed in the sense, that it depends WHAT universe, your talking about. In my opionion, there's different versions of the word. I Could be the only inhabitant of my universe, in that, Do i know or care what happens in the life of the guy that lives on the other side of town? I'll never meet him, and his life will almost certainly NEVER interact with mine. Then there's the Universe we look at as a human race, The thing that our planet floats through.

And as for the perfectly reasonable part of the question: Both situtation above CAN be answered as a yes. Simply because our LIVES can be considered OUR universes. And on cosmic level, even if our Solar system really is just a glass marble in some giant figure's pocket, this being's world COULD be called the Universe.

Mind you this is just my opinion AND my first post to this board =) Feel Free to tear it apart, as it's the only way to learn
 
This is the tired, old, "If a tree falls in the forest and no one is there to hear it does it still make a sound".

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##.
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...
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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