QFT Flashcards
What are the core ideas behind the trace technique?
How do you derive Feynman rules from the Lagrangian?
How do we define integrals, and how do they create delta functions?
What rules govern the incoming/outgoing particles in interaction terms?
How do we define conserved currents and charges under a transformation?
How do we define (Wick’s) Normal Ordering?
What are the various Lagrangians used in QFT?
What are Hamilton’s equations?
How do we define all momenta used in the different fields?
How are the loop integrals constructed from Feynman diagrams?
What are the various field operators used in QFT?
What are the trace identites needed?
How do we treat Majorana particles?
What rules govern Weyl spinors?
What rules govern Dirac matrices (Clifford algebra)?
What are the equations for decay rates & cross-sections?
What is the unitarity of the S-matrix?
What is the Optical theorem?
What is the time evolution propagator?
What are the relationships between the Schrodinger, Heisenberg and interaction pictures?
What are the commutators used between fields and operators?
What are the on-shell renormalisation conditions?
What are the rules for building loop intergrals?
Give an example of Wick’s theorem with four fields, two of which are time ordered.
What is the Feynman propagator, and how is it derived?
What are the renormalisation constants?
