B Is the Universe Infinitely Large Since the Big Bang?

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The discussion centers on whether the universe has always been infinitely large since the Big Bang. It questions if space and time existed outside the Big Bang and whether the universe was infinitely large at that moment. There is speculation about the nature of the vacuum of space and whether the Big Bang is expanding within an infinitely large vacuum. The conversation encourages exploring related threads for further insights on this complex topic. Understanding these concepts is crucial for grasping the universe's structure and origins.
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If the universe is infinitely large, has it always been so? If space and time did not exist outside the big bang, was the universe at the time of the big bang infinitely large? Does this suggest the vacuum of space was infinitely large and the big bang is expanding within it?
 
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If you look at the "Similar Discussions" feature at the bottom of this page, you will find links to the very many threads discussing your question. I suggest that you start by reading some of those.
 

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 'Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".'

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...
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Thread 'Big Bang and Infinite Universe'

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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