  These lectures comprise the second half of a quantum field theory course
given in 2004. Topics include the path integral, loop expansion, Feynman rules,
various regularization methods, renormalization, running couplings and the
renormalization group, fixed points and asymptotic freedom, effective action,
Coleman-Weinberg effective potential, fermions, the axial anomaly, QED, gauge
fixing, nonabelian gauge theories, unitarity, optical theorem, Slavnov-Taylor
identities, beta function of Yang-Mills theory, a heuristic derivation of
asymptotic freedom, instantons in SU(N) gauge theory, theta vacua and the
strong CP problem. 23 homework problems are included.
