I just saw a video where Brian Cox said "there is exactly the right amount of matter to make spacetime flat".
An obvious explanation is that matter is created by the desire of spacetime to be flat. The idea would be that the curvature of space without matter has energy which converts to matter at the standard rate as spacetime smooths out.
And we see spacetime deformation without matter in gravity waves. These do carry a small amount of energy. So maybe you can scale that up to the size of the observable universe and see that the matter we see pouring into the visible universe from all directions is just what is needed to counteract some natural harmonic gravitational oscillation of spacetime.
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