lepton asymmetry

Lepton asymmetry refers to the imbalance between leptons (a group of subatomic particles that includes electrons and neutrinos) and their antiparticles in the universe. In the early universe, similar to matter-antimatter asymmetry, a slight excess of leptons over antileptons could influence the abundance of matter we see today. This imbalance is significant because it may help explain why the universe is filled with matter rather than being a balanced mix of particles and antiparticles that would have mostly annihilated each other. Understanding lepton asymmetry offers insights into the fundamental origins of the universe’s composition.