If gravitational waves – ripples in space time – have a handedness, primordial particles could interact with them to form a dark matter superfluid that spreads through the cosmos

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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