So I've been reading a bunch about the FRW metric and doing FRW dynamics. I had a quick theory question involving the FRW Model in general. So in the Friedmann equations why is it that if the combination of (ρ + 3p) is always positive then it somehow proves the existence of a big bang like singularity in the past?(adsbygoogle = window.adsbygoogle || []).push({});

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# FRW Model clarifying question

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