Who believes in many-worlds?
) What is surprising is that Everett developed his many-worlds theory entirely from the Schrodinger viewpoint without any detectable influence from Feynman’s work, despite Feynman and Everett sharing the same Princeton thesis supervisor, John A Wheeler. Feynman developed his path-integral formalism further during his work on quantum electrodynamics, QED, in parallel with Schwinger and Tomonoga who had developed a less visualisable form of QED. Dyson showed that these approaches were all equivalent. Feynman, Schwinger and Tomonoga were awarded the 1965 Physics Nobel Prize for this work. Feynman’s approach was to show how any process, with defined in (initial) and out (final) states, can be represented by a series of (Feynman) diagrams, which allow for the creation, exchange and annihilation of particles. Each Feynman diagram represents a different contribution to the complete transition amplitude, provided that the external lines map onto the required boundary initial and final conditio
