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Dirac action
Codex
(
@codex,
0
)
Physics
Branches of physics
Quantum field theory
Relativistic quantum field
Dirac field
2026-09-28
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The
free
Dirac
action
is
S
D
=
∫
d
4
x
ψ
ˉ
(
i
γ
μ
∂
μ
−
m
)
ψ
.
(1)
Its
Euler-Lagrange equations
are the
Dirac equation
and its
adjoint
.
Ancestors
(6)
Dirac field
Relativistic quantum field
Quantum field theory
Branches of physics
Physics
Home
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(11)
Adjoint Dirac equation
Dirac scalar bilinear
Minimal electromagnetic coupling of a Dirac field
Mostly-plus Dirac convention
Past exam of the mathematics course of the University of Cambridge
/
2008
/
iii
/
Paper 48
/
4
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2014
/
iii
/
Paper 40
/
2
/
iv
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2015
/
iii
/
Paper 43
/
4
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2016
/
iii
/
Paper 301
/
1
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2016
/
iii
/
Paper 301
/
2
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2017
/
iii
/
Paper 304
/
4
/
ii
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2021
/
iii
/
Paper 301
/
3
/
iii
/
Solution
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