User Bass

11 votes

1 answer

2k views

How to show that $\bar\psi\gamma^\mu\psi$ of a Dirac spinor $\psi$ transforms as a vector?

asked Nov 22, 2015 at 10:19

11 votes

2 answers

930 views

Why is a minimum field configuration called a vacuum state in SSB?

asked Aug 12, 2016 at 9:15

9 votes

7 answers

4k views

Relativistic explanation of attraction between two parallel currents

asked Oct 22, 2015 at 11:14

8 votes

1 answer

2k views

How to show that $\bar\psi\psi$ of a Dirac spinor $\psi$ transforms as a scalar?

asked Nov 21, 2015 at 22:15

7 votes

1 answer

507 views

Infinitesimal rotation of classical fields: why are rotation group representations important?

asked Sep 7, 2015 at 18:39

7 votes

1 answer

2k views

What prevents this third-order QED scattering from having a non-zero amplitude?

asked Jan 18, 2016 at 13:45

5 votes

1 answer

429 views

Why are there both scalar and vector mesons?

asked Mar 16, 2017 at 19:51

5 votes

1 answer

339 views

Why do magnetic field lines describe a force?

asked Oct 11, 2015 at 15:31

4 votes

1 answer

532 views

Probability amplitude for motion from $x_i$ to $x_f$ in Heisenberg picture

asked Sep 13, 2015 at 19:36

4 votes

2 answers

518 views

Complex / real representations of the Lorentz group

asked Sep 2, 2015 at 16:57

4 votes

1 answer

304 views

Does spacetime curvature increase when an attractor's potential energy is converted to kinetic energy?

asked Jul 29, 2015 at 18:47

4 votes

1 answer

2k views

Why are the Euler-Lagrange equations invariant if we add a surface term to the action?

asked Sep 6, 2015 at 19:23

4 votes

1 answer

2k views

Zee's Nutshell: Feynman diagrams "baby problem": Connected vs. Disconnected

asked Oct 30, 2015 at 17:06

4 votes

3 answers

518 views

Interference between two photons, tensor product of individual wave functions?

asked Oct 23, 2015 at 9:05

4 votes

0 answers

299 views

What's the connection between the pole contours of propagators and their causality?

asked Apr 23, 2016 at 11:42

3 votes

1 answer

2k views

Is a Feynman diagram depicting a vacuum bubble "that gets real" valid?

asked Nov 3, 2015 at 15:43

3 votes

3 answers

3k views

Do different creation/annihilation operators always commute?

asked Nov 14, 2015 at 12:08

3 votes

1 answer

2k views

Is the Uncertainty Principle a logical consequence from the Wave-Particle duality?

asked Aug 5, 2015 at 13:08

3 votes

5 answers

2k views

Eigenspaces of angular momentum operator and its square (Casimir operator)

asked Aug 21, 2015 at 19:05

2 votes

0 answers

88 views

What component of the stress–energy tensor contains the kinetic energy of heat? [duplicate]

asked Jul 26, 2015 at 16:09

2 votes

2 answers

773 views

Trivial representation in Clebsch-Gordan decomposition

asked Aug 26, 2015 at 19:38

2 votes

0 answers

318 views

Noether's theorem and translations

asked Dec 21, 2015 at 16:26

2 votes

2 answers

895 views

Why can the spin of a relativistic particle not be orthogonal to its momentum?

asked Jan 8, 2016 at 23:30

2 votes

1 answer

883 views

How to separate an exponential with a Hamiltonian with both momentum and position operators?

asked Oct 20, 2015 at 12:59

2 votes

0 answers

562 views

Spin and polarization, QM vs QFT

asked Oct 21, 2015 at 16:11

1 vote

2 answers

236 views

Interference of two non-entangled photons, calculation using tensor product of Hilbert spaces

asked Oct 23, 2015 at 14:35

1 vote

0 answers

1k views

How to Fourier transform creation/annihilation operators?

asked Nov 15, 2015 at 12:50

1 vote

1 answer

5k views

Derivation of time-dependent Schrödinger equation from De Broglie hypothesis

asked Aug 7, 2015 at 20:54

1 vote

2 answers

220 views

How can a solution of the time-independent Schrödinger equation evolve in space?

asked Aug 8, 2015 at 20:55

1 vote

1 answer

409 views

Can the wall in the double-slit experiment be considered to perform a "half measurement"?

asked Aug 10, 2015 at 8:02

Stack Exchange Network

43 Questions

How to show that $\bar\psi\gamma^\mu\psi$ of a Dirac spinor $\psi$ transforms as a vector?

Why is a minimum field configuration called a vacuum state in SSB?

Relativistic explanation of attraction between two parallel currents

How to show that $\bar\psi\psi$ of a Dirac spinor $\psi$ transforms as a scalar?

Infinitesimal rotation of classical fields: why are rotation group representations important?

What prevents this third-order QED scattering from having a non-zero amplitude?

Why are there both scalar and vector mesons?

Why do magnetic field lines describe a force?

Probability amplitude for motion from $x_i$ to $x_f$ in Heisenberg picture

Complex / real representations of the Lorentz group

Does spacetime curvature increase when an attractor's potential energy is converted to kinetic energy?

Why are the Euler-Lagrange equations invariant if we add a surface term to the action?

Zee's Nutshell: Feynman diagrams "baby problem": Connected vs. Disconnected

Interference between two photons, tensor product of individual wave functions?

What's the connection between the pole contours of propagators and their causality?

Is a Feynman diagram depicting a vacuum bubble "that gets real" valid?

Do different creation/annihilation operators always commute?

Is the Uncertainty Principle a logical consequence from the Wave-Particle duality?

Eigenspaces of angular momentum operator and its square (Casimir operator)

What component of the stress–energy tensor contains the kinetic energy of heat? [duplicate]

Trivial representation in Clebsch-Gordan decomposition

Noether's theorem and translations

Why can the spin of a relativistic particle not be orthogonal to its momentum?

How to separate an exponential with a Hamiltonian with both momentum and position operators?

Spin and polarization, QM vs QFT

Interference of two non-entangled photons, calculation using tensor product of Hilbert spaces

How to Fourier transform creation/annihilation operators?

Derivation of time-dependent Schrödinger equation from De Broglie hypothesis

How can a solution of the time-independent Schrödinger equation evolve in space?

Can the wall in the double-slit experiment be considered to perform a "half measurement"?