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No, Physicists Still Don’t Know Why Matter (And Not Antimatter) Dominates Our Universe

5 Apr 2019, 14:01 UTC
No, Physicists Still Don’t Know Why Matter (And Not Antimatter) Dominates Our Universe
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The LHCb collaboration is far less famous than CMS or ATLAS, but the particles and antiparticles they produce, containing charm and/or bottom quarks, hold new physics hints that the other detectors cannot probe. (CERN / LHCB COLLABORATION)There is a fundamental difference between matter and antimatter. But not enough of one to explain our Universe.Our Universe is a vast and enormous place, and if there’s one thing we can be certain of, space definitely isn’t empty. Everywhere we look, we find evidence for the same cosmic story: the Universe had a hot, dense past, was filled with nearly-equal amounts of matter everywhere, and grew up to form stars, galaxies, and a vast cosmic web as time progressed.Although it’s a beautiful picture, it’s an incomplete one. While we know how the Universe creates atoms, stars, galaxies, planets and more, we don’t yet know why the Universe is full of matter. In physics, matter and antimatter are only ever produced or destroyed in equal amounts, so it’s a puzzle that our Universe is all matter and no antimatter. While a new result from the LHC at CERN is making big waves, it doesn’t solve this problem at all.A CP-symmetry transformation swaps a particle ...

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