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...
 
We often see discussions about what QM and QFT mean, but hardly anything on just how fundamental they are to much of physics. To rectify that, see the following; https://www.cambridge.org/engage/api-gateway/coe/assets/orp/resource/item/66a6a6005101a2ffa86cdd48/original/a-derivation-of-maxwell-s-equations-from-first-principles.pdf 'Somewhat magically, if one then applies local gauge invariance to the Dirac Lagrangian, a field appears, and from this field it is possible to derive Maxwell’s...
I read Hanbury Brown and Twiss's experiment is using one beam but split into two to test their correlation. It said the traditional correlation test were using two beams........ This confused me, sorry. All the correlation tests I learnt such as Stern-Gerlash are using one beam? (Sorry if I am wrong) I was also told traditional interferometers are concerning about amplitude but Hanbury Brown and Twiss were concerning about intensity? Isn't the square of amplitude is the intensity? Please...
This is still a great mystery, Einstein called it ""spooky action at a distance" But science and mathematics are full of concepts which at first cause great bafflement but in due course are just accepted. In the case of Quantum Mechanics this gave rise to the saying "Shut up and calculate". In other words, don't try to "understand it" just accept that the mathematics works. The square root of minus one is another example - it does not exist and yet electrical engineers use it to do...
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