Well they Steinhardt, Hawking, and a raft of others can't explain the origin of anything not time, not space, not physical causation absent an ex nihilo beginning. But they do not want a beginning, especially an ex nihilo one. For such a beginning would be inconceivable to a person of physicalist/materialist persuasion. They will stand on their heads; they will turn themselves inside-out. They will do anything to deny the existence of God. WHY this is so important to them, I do not know.
Whatever the case, theoretical physicists of such high order and reputation as Hawking and Steinhardt are mathematical physicists. And as any "math geek" knows, when one's equations are generating a situation known as infinite regression, the alarm bells should be going off all over the place. This is the classical sign that there's something wrong with your formulation. Time to go back and check, to find the error....
Mad Dawg's most excellent Post #1247 is definitely on-point here.
Thank you oh so very much for your totally outstanding essay/post, dearest sister in Christ!
Thank you for sharing your insights, dearest sister in Christ!