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+ | ====== Cocycles ====== | ||
+ | |||
+ | <tabbox Why is it interesting?> | ||
+ | |||
+ | "In field theory and in modern elementary particle theory, cocycles | ||
+ | are used to describe [[advanced_notions:quantum_field_theory:anomalies|anomalies]]." ([[https://inspirehep.net/record/213998/files/v15-n3-p99.pdf|Source]]) | ||
+ | |||
+ | 1-cocycles are used to understand anomalies in the Lagrangian framework. The 1-cocycles show up in the non-conservation of classically conserved currents. | ||
+ | |||
+ | 2-cocycles are used to understand anomalies in the Hamiltonian framework. They have the effect that it becomes impossible to satisfy Gauss' law. | ||
+ | ([[https://inspirehep.net/record/213998/files/v15-n3-p99.pdf|Source]]) | ||
+ | <tabbox Layman> | ||
+ | |||
+ | <note tip> | ||
+ | Explanations in this section should contain no formulas, but instead colloquial things like you would hear them during a coffee break or at a cocktail party. | ||
+ | </note> | ||
+ | | ||
+ | <tabbox Student> | ||
+ | For a great introduction see https://inspirehep.net/record/213998/files/v15-n3-p99.pdf and chapter III in Analysis On Infinite Dimensional Manifolds: Schrodinger Representation For Quantized Fields by R. Jackiw | ||
+ | <tabbox Researcher> | ||
+ | |||
+ | <note tip> | ||
+ | The motto in this section is: //the higher the level of abstraction, the better//. | ||
+ | </note> | ||
+ | |||
+ | --> Common Question 1# | ||
+ | |||
+ | |||
+ | <-- | ||
+ | |||
+ | --> Common Question 2# | ||
+ | |||
+ | |||
+ | <-- | ||
+ | | ||
+ | <tabbox Examples> | ||
+ | |||
+ | --> Example1# | ||
+ | |||
+ | |||
+ | <-- | ||
+ | |||
+ | --> Example2:# | ||
+ | |||
+ | |||
+ | <-- | ||
+ | | ||
+ | <tabbox History> | ||
+ | |||
+ | </tabbox> | ||
+ | |||