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A new study suggests that many theorized heavy particles, if they exist at all, do not have the properties needed to explain the predominance of matter over antimatter in the universe.
If confirmed, the findings would force significant revisions to several prominent theories posed as alternatives to the Standard Model of particle physics, which was developed in the early 1970s. Researchers from Yale, Harvard, and Northwestern University conducted the study, which was published Oct. 17 in the journal Nature.
The discovery is a window into the mind-bending nature of particles, energy, and forces at infinitesimal scales, specifically in the quantum realm, where even a perfect vacuum is not truly empty. Whether that emptiness is located between stars or between molecules, numerous experiments have shown that any vacuum is filled with every type of subatomic particle — and their antimatter counterparts — constantly popping in and out of existence.
Source: https://news.yale.edu/2018/10/17/new-study-sets-size-limit-undiscovered-subatomic-particles
(Score: 3, Informative) by RandomFactor on Sunday October 28 2018, @05:08PM
Consensus has always been that anti-matter was the same as matter from gravity's perspective.
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Last I heard they hadn't conclusively proved it either and speculation remains. They were playing with laser cooled anti-hydrogen molecules experimentally to check on that exact question. Not sure if that's come to any conclusion yet, but if it turned that out gravity worked backwards for anti-matter you can bet we would have heard about THAT :-)
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