Feynman's Infinite Quantum Paths

How to predict the path of a quantum particle. Part 3 in our Quantum Field Theory Series. Get your own Space Time t­shirt at Tweet at us! @pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Comment on Reddit: Help translate our videos! Previous Episode: The First Quantum Field Theory There is a fundamental limit to the knowability of the universe. The Heisenberg uncertainty principle tells us that the more precisely we try to define one property, the less definable is its counterpart. Knowing a particle’s location perfectly means its velocity is unknowable. But unmeasured properties are not just uncertain; they are undefined. Quantum mechanics seems to imply that ALL possible properties, paths, or events that could reasonably occur between measurements DO occur. Whether or not this is true, a mathematical description of this crazy idea led to the most powerful expression of quantum mechanics ever devised: Richard Feynman’s path integral formulation. Written and Hosted by Matt O’Dowd Produced by Rusty Ward Graphics by Kurt Ross Made by Kornhaber Brown (www.kornhaberbrown.com) Comments answer by Matt: Satya Prakash Jakub Mintal The EEZZ Lazarus The adventurer ForTiorI Big Bang CoolAsCats Shane Robinson David Nicklas Eugene Lawson Joshua Davis Quasar Tambe Barsbay Max Levine Mayank M. Mehrota Mars Yentur Hypernova Chuck Zegar Jordan Young Ratfeast John Hofmann Joseph Salomone Martha Hunt Craig Peterson Prof. Dr. Kenneth Michael Beck Science Via Markets Justin Lloyd Sultan Alkhulaifi Alex Seto Conor Dillon Jared Moore Michal-Peanut Karmi Bernardo Higuera Erik Stein Daniel Lyons Kevin Warne JJ Bagnell J Rejc Amy Jie Avi Goldfinger John Pettit Shannan Catalano Florian Stinglmayr Yubo Du Benoit Pagé-Guitard Nathan Leniz Jessica Fraley Loro Lukic Brandon Labonte David Crane Greg Weiss