Peccei-Quinn Symmetry

The Peccei-Quinn symmetry is a theoretical idea in physics proposed to solve the strong CP problem, which questions why certain particles in atomic nuclei behave in a symmetric way despite expectations otherwise. It introduces a new kind of symmetry that, when broken, predicts a new particle called the axion. The axion acts as a natural mechanism to cancel out the expected asymmetry, helping explain why nature appears so symmetric in this context. This concept bridges our understanding of fundamental forces and particles, providing insights into the underlying order of the universe.