What does it mean by “if neutrinos are their own anti-particle, it explains why the universe exists”?

Question

Confused after reading the following article.

https://www.cbc.ca/radio/ideas/particle-astrophysics-studying-origin-of-universe-1.6733153

In: 17

Answer 1

There’s a fundamental problem physicists have been trying to solve for a long time: why is the universe made out of matter?

We know that antimatter exists, we know that matter and antimatter annihilate each other. What we don’t know is why the universe is made almost entirely of matter.

If matter and antimatter ‘came into existence’ in the same way at the same time, hypothetically there would have been an equal amount of each, they would have annihilated each other, and the universe would not exist as we know it.

This didn’t happen, therefore there must be something about matter and antimatter that we don’t understand. The article doesn’t go into detail, but the behavior of the neutrino is giving us clues as to why that imbalance exists.