👉 Gallivanter is a concept in quantum mechanics, which is the branch of physics that studies matter at the atomic and subatomic level. It's a term used to describe a hypothetical particle or wave that can exist simultaneously on two different positions or points in space-time. The concept was proposed by physicist Walter Gallivan (1908-1972) in 1936, who believed it could be a fundamental principle of quantum mechanics. The term "gallivan