to correct a misunderstanding even talking to myself bcus inflation happened before bigbang
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the inherent quantum nature of our Universe were seeded during cosmic inflation: a phase that preceded and set up the hot Big Bang
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https://bigthink.com/starts-with-a-bang/particle-physics-path-forward/

i used to think of big bang as the start of spacetime itself but it's a state of the universe when it had a very low entropy. inflation began first during which spacetime expanded so rapidly then as it ended it dumped all remaining energy that manifested as the big bang