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Student Friendly Introduction to QFT
· Problem 26
Spinors: Spin ½ Fields
Physics — QFT · dirac-momentum-operator-example
Problem
Do Prob. 26 as an example of the 3-momentum operator
P
=
∑
r
,
p
p
(
N
r
(
p
)
+
N
ˉ
r
(
p
)
)
\mathbf{P} = \sum_{r,\mathbf{p}} \mathbf{p}\left(N_r(\mathbf{p}) + \bar{N}_r(\mathbf{p})\right)
P
=
∑
r
,
p
p
(
N
r
(
p
)
+
N
ˉ
r
(
p
)
)
acting on a multiparticle state.
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