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If all energy in the universe was turned to mass would gravity work?

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    $\begingroup$ The same as it always does. I'd look at classical models of a pure matter, pure energy, and mix of both, in GR. You can find references in MTW, Robert Wald's text, and just about any other. $\endgroup$
    – user196418
    Commented Jun 8, 2021 at 16:35
  • $\begingroup$ Altho comments aren't the venue for answers, it might help the OP to improve their question if I point out the fact that Penrose's CCC model (which may, given his long & extremely successful career in physics, become the leading one, now that the "measure problem" of field-based inflationary models has remained intractable for decades) has entropy working to clump matter into gravitational fields, whereas a dispersal of mass, during a complete conversion of matter into energy, characterizes the entropic effects of the passage of time, at each end of a past- & future-eternal infinity of aeons. $\endgroup$
    – Edouard
    Commented Jun 10, 2021 at 18:16

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