Strange “right-handed” neutrinos may be responsible for all the matter in the universe, according to new research.
Why is the universe filled with something other than nothing? Almost all fundamental interactions in physics are exactly symmetrical, meaning that they produce just as much matter as they do antimatter. But the universe is filled with only matter, with antimatter only appearing in the occasional high-energy process.. There are three varieties, and they each have almost no mass.
Back in the early universe, these two kinds of neutrinos would have mixed together more freely. But as the cosmos expanded and cooled, this even symmetry broke, rendering the heavy right-handed neutrinos invisible. In the process, the symmetry breaking would separate matter from antimatter. The researchers behind the paper propose that the right-handed neutrinos didn’t completely disappear from the cosmic scene. Instead, they mixed together to form yet another new entity: the Majoran, a hypothetical kind of particle that is its own anti-particle. The Majoran would still inhabit the cosmos, surviving as a relic of those ancient times.
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