Eli5: If the concept of time as we understand it didn’t exist before the Big Bang, can the most popular theories be explained to me as to how “all of it” started?
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Don’t know how. All we have is a video of the universe expanding, and we can “roll it backwards” and use our current understanding of the laws of physics to get pretty close to explaining what may have happened after the Big Bang event. But it all relies on the assumption that the laws of physics are the same, more or less, in time and across space. And clearly the laws of physics break down to something like “divide by zero” the closer we get to the Big Bang event. Or the closer we try to get to traveling at the speed of light.
I don’t think the forum rules permit speculation, but one theory, for example, could be that all the black holes in the universe feed mass *back in time* to be expulsed / ejected at the Big Bang event location and moment.
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