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Originally Posted by Nereid
mugaliens, would you mind clarifying your OP please?
That photons, as pure energy, "actually [have] a gravitational component" is already built in to GR, and (as Ken G points out), the early universe (in the concordance model) did comprise 'pure energy'.
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Cool.
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What do you mean by "gravitation component would have been strong enough to hold in everything, including light (energy)"? The universe is everything, and the "gravitation component" of its (mass-)energy content is what determines its history.
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It's probably a perceptual/conception thing on my part, but my brain finds it difficult to perceive how black holes, which weigh much less than the entire universe, can exist, while when you put all the mass of the universe in a space the size of a marble, it someone fails to collapse into a black hole, and instead, this quark soup expands.