So, I’m trying to understand cosmic inflation a bit better, and I’ve concluded that I don’t understand one of the chief itches that it scratches. I know the standard explanation about regions of space being too far apart to have ever interacted, but I don’t get why they couldn’t have interacted when the universe was the size of an atom.
If the answer is that there wasn’t enough time for the universe to expand without inflation, why the time limit? Why can’t the solution be that the universe is a bit older?
If any of my readers with physics expertise know the answer, I’d be grateful.