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The short answer to this question is that we do not know. The subject of your question is still in early "speculative", theorizing, and researching stages. I can say this because collisions of bubble universes under the eternal inflation theory just happens to be my specific area of work. Non-colliding bubble universes (and the local potential minima in the ...

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The expansion of the universe is (approximately) described by the FLRW metric. The Wikipedia article I've linked gives lots of gory details, but the key result we need is the dependance on the acceleration on the density and pressure: $$\frac{\ddot{a}}{a} = -\frac{4\pi G}{3}\left( \rho + \frac{3p}{c^2} \right) + \frac{\Delta c^2}{3}$$ If there is no dark ...

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I guess that you are imagining an expansive force accelerating the Universe versus gravity pulling the Universe together, and that if somehow gravity were weaker, the expansive force would win. That is not the correct picture. In popular models, the accelerating Universe is caused by gravity, because of a vacuum energy with negative pressure (see dark ...

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I think the term acceleration implies a change in direction of the net forces acting on galaxies on the large scale. Gravity (regardless of magnitude) acts to collect the galaxies, while the acceleration acts in the opposite direction.

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