If the universe is primarily matter, where did all the anti-matter go?
The theory Drs Cui and Zhong-Zh wanted to explore is known as leptogenesis, a process involving particle decay that could have led to the asymmetry between matter and antimatter in the early universe. An asymmetry in certain types of elementary particles in the very earliest moments of the cosmos, in other words, could have grown over time and through further particle interactions into the asymmetry between matter and antimatter that made the universe as we know it — and life — possible.
For more, check out this Independent story.