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Dark matter could be produced by twisted gravitational waves

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A visualization of a supercomputer simulation of merging black holes sending out gravitational waves

Give us a wave! Right-handed or left-handed?

Henze/NASA

Solving the case of the universe’s missing antimatter may help us pin down one other thing we can’t seem to find: dark matter. The solution involves a twist in the tale of gravitational waves.

Matter and antimatter should have been produced in equal amounts after the big bang. But antimatter is nowhere to be found.

Physicists think that primordial processes produced a tiny excess of matter over antimatter. When matter meets antimatter, it annihilates. So, the leftover excess of matter would have given us stars and …

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