2
Free field theory
III Quantum Field Theory
2
F
ree
field
theory
So
far,
we’v
e
just
b
een
talking
ab
out
classical
field
theory
.
W
e
no
w
wan
t
to
quan
tize
this,
and
actually
do
quantum
field
theory
.
Contents
2.1 Review of simple harmonic oscillator
2.2 The quantum field
2.3 Real scalar fields
2.4 Complex scalar fields
2.5 The Heisenberg picture
2.6 Propagators
< 1.4
Table of Contents
2.1 >