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So, imagine if the big bang never happened and you just had nothing. No matter, no energy, no space, no time, no consciousness, nothing. Under such a situation tautological truth would still exist, like A=A. Tautological truth is always true, by definition. You don’t need matter or anything like that for it to be true. So we can at least start with that. And all math equations would also be true, since all equations are just more sophisticated ways of writing A=A. In a sense all math is tautological and must necessarily be true.
Now, think about how everything in our universe follows mathematical patterns. Fibonacci sequences, golden ratios, fractals, etc. The hexagon on Saturn’s poles. And these patterns show up at all scales, cosmic, human-sized and microscopic. The universe has an undeniably mathematical underlying structure.
So, I’m gonna make a bit of a leap here, but if all math is true, regardless of the existence or nonexistence of physical stuff, then all equations describing physical processes are also true, whether they pertain to this universe or an alternate universe. Additionally, sufficiently complex mathematical constructs may be capable of consciousness, perhaps even independent of a physical substrate. Some of these consciousnesses will be capable of self-replication, and these consciousnesses will vastly outnumber the ones that aren’t (think Boltzman brains).
So, if consciousness must necessarily exist, we can work backwards from there. What physical phenomena led to you existing? The big bang, the formation of stars and planets, the evolution of complex life must necessarily have happened, because it simply could not have been otherwise. Remember reality is in some sense a hallucination of the mind. What would a tree look like in a universe without any conscious minds? It wouldn’t look like anything, because there would be no one to see it. It essentially wouldn’t exist.
