Lorentz invariance of Dirac equation if $\gamma^\mu$-matrices were numbers
116427
$(c^{\mu}\partial_{\mu}-m)\phi(x)=0$ not Lorentz-invariant?
108384
Special Relativity and $E = mc^2$
113072
Index notation Lorentz transfromation matrix
38723
Can Poincare representations be embedded in non-standard Lorentz representations?
125647
Solutions to the matrix equation $\mathbf{AB-BA=I}$ over general fields
86901
Galilean covariance of the Schrodinger equation
34228
Lorentz Invariant Integration Measure
32896
Vector spaces for the irreducible representations of the Lorentz Group
74702
Are Lorentz transformations linear transformations?
112216
Geometric description of canonical commutation relation
143315
How does the Lorentz group act on a 4-vector in the spinor-helicity formalism $p_{\alpha\dot{\alpha}}$?
22279
Local and Global Symmetries
96784
Klein-Gordon-Equation contains no Spin
130497
Understanding Dirac's notation
147524
Why is the "canonical momentum" for the Dirac equation not defined in terms of the "gauge covariant derivative"?
155043
Substitution $\partial_\mu \to D_\mu \equiv \partial_\mu + ieA_\mu$ allows the introduction of electromagnetic interactions
101944
Fundamental invariants of the electromagnetic field