Quote:
Originally Posted by Little Bang
I must make the assumption that gravity did not exist for the next several months or even years
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The link CragD gave (
wikipedia article “timeline of the big bang”) is very good. It answers your question saying that during the Planck epoch (first

seconds of the universe) gravity was most-likely unified with the other 3 forces of the universe. After the Plank epoch gravity separates from the other forces. By the quark epoch (

seconds), "The fundamental interactions of gravitation, electromagnetism, the strong interaction and the weak interaction have now taken their present forms"
Quote:
Originally Posted by Little Bang
since the entire mass of the universe is contained within this expanding sphere one would think that like a black hole nothing could escape.
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As far as I know, nothing has escaped the universe.
~modest