Wave-particle duality means tiny things—like photons, electrons, and atoms—can behave like both waves and particles, depending on how we test them. In the double-slit experiment, quantum objects can produce an interference pattern, as if their possible paths overlap like waves. But when the experiment reveals which path they took, the interference pattern disappears, and we get particle-like results.
Some physicists connect this mystery to the multiverse. In the many-worlds interpretation, the wavefunction does not collapse into one outcome. Instead, every possible outcome happens, but each one unfolds in a different branch of reality. In one branch, the particle is detected here. In another, it is detected there.
Does this prove a multiverse? No.
Wave-particle duality is an empirical feature of quantum mechanics. The wavefunction is a rational model that predicts what we observe. The multiverse is one possible metaphysical interpretation of what the math might mean.
So, wave-particle duality does not imply a multiverse by itself. It opens the door to the question. Many-worlds walks through that door. Other interpretations do not.
That is the key distinction: quantum behavior is real, the math works, but the multiverse remains speculative.
