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.
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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.
Chapter 4
Richard Feynman created the sum over histories theory to explain this. A particle is said to travel from A to B by...
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Chapter 7
...singularities, and Hawking’s work turned in that direction in the late 70s, focusing on Feynman’s sum over histories .
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Chapter 8
...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...
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To calculate sum over histories , one must use imaginary time, that is, imaginary numbers to represent time, which clears...
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...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...
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Each sum over histories history offers a comprehensive account of space-time and its contents. Again, the anthropic principle can...
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By applying the sum over histories and no boundary theory, one can find which characteristics of the universe are likely to...
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Chapter 10
...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...
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Feynman’s sum over histories allows time travel on a miniscule scale. As particles follow the C, P, and T...
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