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bolbteppa
  • Member for 10 years, 11 months
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23 votes
Accepted

Relation between the Dirac Algebra and the Lorentz group

21 votes
Accepted

Levi Civita identity

12 votes

What do field operators in QFT act on?

11 votes

Can spinors be explained or understood without group or representation theory?

7 votes

Why is the second law of thermodynamics not symmetric with respect to time reversal?

7 votes

Hamiltonian Field Theory in Peskin & Schroeder

7 votes

Is this a Taylor approximation? How is it done?

6 votes
Accepted

How are the SUVAT equations derived?

6 votes

I'm not seeing any measurement/wave function collapse issue in quantum mechanics

5 votes
Accepted

Covariant derivative of spherical harmonics

4 votes

Quantized Dirac fields' plane wave component— better, deeper understanding

4 votes
Accepted

Commutator of the Pauli-Lubanski vector operator and the generator of translations $P^\alpha$

4 votes
Accepted

Dirac equation in 1+1D spacetime compared to "standard" 3+1D Dirac equation

4 votes

Matrix diagonalization in SU(2) and SO(3)

3 votes
Accepted

Deriving Pauli Matrices

3 votes
Accepted

$\int (f(x+\delta x) - f(x)) dx = \int \left ( \frac{df(x)}{dx} \delta x \right) dx$

3 votes
Accepted

Deriving $\Lambda^i_{\,j}$ components of the Lorentz transformation matrix

3 votes

What is the derivation for the moment of inertia of a point mass?

3 votes

Intuition for the indices of the Riemann tensor

3 votes

(L&L vol. 4, sec. 7) Normalization of Spherical Wavefunctions of Photons

3 votes
Accepted

Decomposing direct product of spin-$s$ representation into direct sum

3 votes
Accepted

Regge Theory references and predictive power

3 votes

The Origins of the Second Quantization

3 votes

Physical intuition of raising and lowering indices in GR

2 votes
Accepted

Fermions in a micro-canonical ensemble

2 votes

Dirac delta function defined in Zee's Quantum Field Theory book

2 votes

Using separation of variables to solve Schrödinger equation for a free particle

2 votes
Accepted

Quantum Scattering, normalization and the differential cross section

2 votes

How to find the rank of the matrix $\frac{\partial ^2\mathcal{L}}{\partial \dot{X^\mu} \partial \dot{X^\nu} }$ for the Nambu-Goto string Lagrangian?

2 votes
Accepted

Area element with worldsheet metric in Polyakov action