The Secrets of Feynman Diagrams | Space Time

Captions provided by CCTubes – Captioning the Internet! Unlock the secrets of Feynman Diagrams. Part 5 in our Quantum Field Theory series. And if you’re submitting an answer to our challenge question email your answer by August 2nd to pbsspacetime [AT] gmail.com with the subject line “Feynman Diagram Challenge.”

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Previous Episode:
The Real Star Wars
https://www.youtube.com/watch?v=Q8shnjlGwmg

Feynman’s path integral shows us that, to properly calculate the probability of a particle traveling from point A to point B, we need to add up the contributions from all conceivable paths between those points – including the impossible paths! In fact we can go even further: according to Feynman’s approach, every conceivable happening that leads from a measured initial state to a measured final state DOES in a sense happen. To calculate the probability of any quantum system evolving from one state into any other state we need to sum over every conceivable intermediate state. This is impossible because there are infinite possible intermediate states.

Written and Hosted by Matt O’Dowd
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Comments answer by Matt:

Superphilipp
https://www.youtube.com/watch?v=Q8shnjlGwmg&lc=z13act14kwqcvv2nn22muvvztxqnjjryt04

Lewinham
https://www.youtube.com/watch?v=Q8shnjlGwmg&lc=z12ajhwg3nubdnhaz04cfjfjumr2w5krek40k

Myrmidon
https://www.youtube.com/watch?v=Q8shnjlGwmg&lc=z12xupq5qqiqdbl4h04chd4x0syuxfnb1nk0k
Sure people love Star Wars. But I think they missed a golden opportunity to call the project Ronald Ray-gun.

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