Richard Feynman first came up with the idea that particles do not have one history, but rather have every possible history. This means scientists cannot say exactly how a particle traveled from A to B, but by calculating all the possible routes from A to B, they can find the most likely one.
Sum over histories Term Timeline in A Brief History of Time
The timeline below shows where the term Sum over histories appears in A Brief History of Time. The colored dots and icons indicate which themes are associated with that appearance.
...consistent theory that combines quantum theory and gravity. If there were, it should involve Feynmann’s sum over histories proposal, which states particles move from A to B by every possible path. Scientists know... (full context)
...mechanics and general relativity is that gravity is represented in a curved space-time. Applying the sum over histories to Einstein’s ideas on gravity, the history of a particle is a complete curved space-time... (full context)
...time travelers going back into alternative pasts, with total free will. This sounds like Feynman’s sum over histories , which states the universe had every possible history. But, each history would be self... (full context)