Is Space Really a Vacuum and Does it Determine the Size of the Universe?

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if a vacuum is really absoloutly nothing wouldn't that mean there is no edge of of the universe and so the universe is infinite.
 
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pikapika! said:
if a vacuum is really absoloutly nothing wouldn't that mean there is no edge of of the universe and so the universe is infinite.


The vacuum is NOT empty...it is a common mistake to think that. Besides, we even have experiments that prove, the vacuum is not empty...

https://www.physicsforums.com/journal.php?s=&action=view&journalid=13790&perpage=10&page=2

scroll down until you come at the "string theory part 1"-entry and read to first two paragrafs. they will explain you why the vacuum is not empty...

enjoy

regards
marlon
 
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And whether or not a vacuum is nothing is irrelevant to whether or not the universe is infinite.
 
russ_watters said:
And whether or not a vacuum is nothing is irrelevant to whether or not the universe is infinite.
well, I think he was eluding to the idea that space is a vacuum and he sort of connected space and the universe together...
 
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I am reading WHAT IS A QUANTUM FIELD THEORY?" A First Introduction for Mathematicians. The author states (2.4 Finite versus Continuous Models) that the use of continuity causes the infinities in QFT: 'Mathematicians are trained to think of physical space as R3. But our continuous model of physical space as R3 is of course an idealization, both at the scale of the very large and at the scale of the very small. This idealization has proved to be very powerful, but in the case of Quantum...
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