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It is not known whether antimatter is repulsed by or attracted to matter. For the purpose of this question, I assume that antimatter is repulsive to regular matter (otherwise this question makes no sense). This debate is not the point of the question.

If there was a massive (much larger than a galaxy) amount of antimatter at the center of the known universe, it would cause expansion of galaxies around it since it's repulsive force would be greater than galaxies attractive forces. This seems like a simpler explanation than positing the existence of dark energy. However, I am not knowledgeable enough to know if the kind of repulsion that would cause at all fits the repulsion that is actually observed.

Could a super massive amount of antimatter (assuming anti-gravity) cause the actual observed expansion of the universe?

Qmechanic
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rtpax
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The annihilation radiation the would be generated where this enormous amount of antimatter comes in contact with normal matter should be all over the place. Besides antimatter should attract, not repel matter as both have positive energy.

my2cts
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  • Why would we expect there to be any collision of antimatter when all antimatter would be inside the gravity well and all matter outside of it? With enough gravity to cause something as massive as the expansion of the universe, surely it would be penetrated very rarely if at all (I might be wrong, but please clarify why) – rtpax Mar 19 '19 at 19:16