I'm trying to understand how the idea of an infinite universe with presumably infinite matter works with the Big Bang and inflation.
I understand that if the universe is infinite, then it's always been infinite, and that when we talk about the initial universe being very very small, dense and hot we are referring to the observable universe (correct me if I'm wrong). So let's say in our infinitely sized universe, there's a galaxy (Graham's Number)^(Graham's Number)^(Graham's Number) light years away, or some huge distance like that.
Would this galaxy have also been very close, hot and dense with our observable universe? If so, what if I just keep increasing the distance since I've assumed the universe is infinitely big? And if not, would it have had its own separate big bang?
So my question is how really really far away regions of the universe were affected by the big bang, if the universe is infinite since they couldn't have all been close to each other in a very hot and dense state.