energy was never created during said big bang, the big bang is an expansionary model for the development of our observable universe, we do not know what the universe consisted of before this expansion, energy and matter were never created they had always existed in a state that had inherently no stability to form complex structures all compacted on a single point in space that as far as we can tell was a singularity. for your brain to understand we just say everything was compacted to an infinitely small point, that was infinitely hot the reason black holes are cold singularities is because the vacuum energy is low
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