A question about Lorentz invariant argument when writing down the Dirac equation
116427
$(c^{\mu}\partial_{\mu}-m)\phi(x)=0$ not Lorentz-invariant?
125081
What is the reasoning that leads one to postulate this second form for the relativistic particle action?
74065
Proof of de Broglie wavelength for electron
69423
Pure Lorentz boost; transpose $\neq$ inverse?
63304
The Dirac-delta function as an initial state for the quantum free particle
10109
What quantities are Lorenz-Invariant?
126388
Derivation of Lorentz Transformations
123776
Questions about the Fermi-Dirac distribution at $T=0.$
153205
Why is the $(\frac{1}{2},\frac{1}{2})$ representation of the Lorentz group realized as the vector space of Hermitian $2\times 2$ matrices?
70880
Invariance of canonical Hamiltonian equation when adding the total time derivative of a function of $q_i$ and $t$ to the Lagrangian
140184
Why all theories are Lorentz invariant?
99312
Why Lagrangian is negative number for a relativistic massive point particle?
138883
How to get the fourth component of EOM in a relativistic formulation of a charged particle in an electromagnetic field?
54857
The wave equation in general relativity, special relativity, and Cartesian coordinates
18583
What conservation law corresponds to Lorentz boosts?
108384
Special Relativity and $E = mc^2$
98303
Ward identity derived from global symmetry and SDE, different from that derived from gauge symmetry?