Isn't the current thinking along the lines, vastly simplifiedWell, let me ask you, do you think the Big Bang was caused or uncaused? If caused, then caused by what?
If it, or whatever caused it, arose randomly, that would be uncaused.
It impossible for a vacuum to exist so the low pressure state caused particles to flip in and out of existence
It happened that the particles flipping in and out interacted
Result was a rapid expansion where and the when of the Universe started
Least that's how my 2 year old explained it to me