Why did the universe end up with more matter than antimatter? Jessie Shelton of Yale University and Kathryn Zurek at the University of Michigan in Ann Arbor say the imbalance could have begun in dark matter particles, which then transmitted the imbalance to visible matter. In their "darkogenesis" scenario, they suggest that when the hot, early universe cooled, it wasn't smooth but uneven and bubbly -at least in the "dark sector". This led to an imbalance between the number of dark matter particles and their antiparticles.
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