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schris38's user avatar
schris38's user avatar
schris38
  • Member for 4 years, 7 months
  • Last seen this week
8 votes
Accepted

How does the absence of quadratic terms in the Lagrangian imply massless quanta?

8 votes

Do Quantum fields describe reality or are reality?

8 votes

What are Quantum Field Theories?

6 votes
Accepted

BRST Symmetry and Single Particle States

6 votes
Accepted

Pauli-Lubanski vector for Maxwell's equation

5 votes

Single-particle states vs. basis states vs. eigenkets vs. quantum numbers

5 votes

Morin 2.16 - Balancing a semi-infinite stick

5 votes
Accepted

LSZ Reduction formula: Peskin and Schroeder

3 votes
Accepted

In quantum mechanics, why is it useful to apply operators to anything other than eigenfunctions, when only eigenfunctions correspond to observables?

3 votes

Charge density of a point charge given the 4-current

3 votes
Accepted

time-dependent perturbation theory

3 votes
Accepted

Peskin and Schroeder p. 409 “quadratically divergent mass renormalization”

3 votes

Multiplication and significant figures

3 votes

What is a soft photon?

3 votes
Accepted

Matrix elements $\langle n,k|x|n',k'\rangle$ for Bloch states

3 votes

Does there exist a square root of Euler-Lagrange equations of a field? (Factorization)

3 votes
Accepted

Clarifying Bra-Ket Notation: Orthonormal Bases

3 votes

How is the Feynman propagator (Green's function) connected with the field?

3 votes
Accepted

Omitting the negative exponential in the plane-wave solution of the Schrodinger equation

3 votes

Translation invariance Noether's equation

3 votes
Accepted

Goldstein's derivation of Noether's theorem

2 votes
Accepted

Imaginary part of IR divergence in gravitational S-matrix

2 votes

Jackson 2.8, Why is the first term in Fourier Series separate?

2 votes

Could someone elaborate what it means for there to be an inverse relation between transformations on function space and transformation on coordinates?

2 votes

Why do the wavefunction wavenumbers for a box and for a periodic potential differ?

2 votes

Hamiltonian Open String

2 votes

What is the wave function of a field?

2 votes
Accepted

Lorentz invariance of the Dirac equation and implicability of the Klein-Gordon equation from the Dirac equation

2 votes

Riemann-Lebesgue lemma in Faddeev-Kulish approach

2 votes

Calculations with co- and contravariant formalism in QFT