User jpm

20 votes

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Are there forces which do not involve a change in momentum?

answered Mar 6, 2014 at 17:15

19 votes

Do gamma matrices form a basis?

answered Mar 5, 2014 at 9:23

9 votes

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Symmetries of the theory that are not symmetries of the action nor of the measure?

answered Feb 25, 2018 at 0:37

7 votes

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Confusion with LSZ reduction formula

answered Mar 9, 2014 at 13:44

6 votes

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How to verify this statement in optical theorem?

answered Mar 27, 2020 at 19:19

5 votes

Multivariable Dirac Delta and Faddeev-Popov Determinant

answered Feb 28, 2014 at 12:34

4 votes

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Killing vector contractions along isometric curves

answered Mar 13, 2014 at 16:07

3 votes

Monopole operator: correlation functions

answered Mar 31, 2020 at 8:32

3 votes

Dirac equation in QFT vs relativistic QM

answered Feb 28, 2014 at 18:37

3 votes

From representations to field theories

answered Mar 7, 2014 at 13:45

3 votes

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Electomagnetic Field Quantization

answered Mar 1, 2014 at 23:19

3 votes

Why in the relativistic quantum mechanics $ \gamma_4$ name is not used instead of $ \gamma_5$?

answered Mar 2, 2014 at 21:53

2 votes

When can i separate spin from the wavefunction?

answered Mar 1, 2014 at 14:56

2 votes

What will be the relative speed of a photon in a light ray to another photon of opposite direction light ray?

answered Mar 1, 2014 at 19:52

2 votes

Comparing predictions and reality for the gravitational attraction due to light beams

answered Feb 28, 2014 at 13:19

2 votes

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Coulomb repulsion in superconductivity

answered Apr 3, 2020 at 6:35

2 votes

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Why does this amplitude not factorise into subamplitudes?

answered Apr 4, 2020 at 6:14

2 votes

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Normalization of the Chern-Simons action in the Dijkgraaf-Witten paper

answered Apr 4, 2020 at 6:50

2 votes

What causes here an apparent violation of Elitzur's theorem?

answered Apr 5, 2020 at 2:22

2 votes

Quantum symmetries: $S$ or $Z$?

answered Mar 10, 2018 at 4:25

2 votes

Does 4D ${\cal N} = 3$ supersymmetry exist?

answered Mar 14, 2018 at 15:17

1 vote

Faster ways of computing feynman diagrams

answered Feb 9, 2019 at 23:59

1 vote

Why we can't write low energy effective field theory for a gapless system?

answered Feb 10, 2019 at 0:15

1 vote

A simple question about the scattering amplitude $\mathcal{M}$ in QFT

answered Mar 14, 2018 at 4:29

1 vote

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Energy of quarks and the mass of the proton

answered Feb 28, 2014 at 13:56

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25 Answers

Are there forces which do not involve a change in momentum?

Do gamma matrices form a basis?

Symmetries of the theory that are not symmetries of the action nor of the measure?

Confusion with LSZ reduction formula

How to verify this statement in optical theorem?

Multivariable Dirac Delta and Faddeev-Popov Determinant

Killing vector contractions along isometric curves

Monopole operator: correlation functions

Dirac equation in QFT vs relativistic QM

From representations to field theories

Electomagnetic Field Quantization

Why in the relativistic quantum mechanics $ \gamma_4$ name is not used instead of $ \gamma_5$?

When can i separate spin from the wavefunction?

What will be the relative speed of a photon in a light ray to another photon of opposite direction light ray?

Comparing predictions and reality for the gravitational attraction due to light beams

Coulomb repulsion in superconductivity

Why does this amplitude not factorise into subamplitudes?

Normalization of the Chern-Simons action in the Dijkgraaf-Witten paper

What causes here an apparent violation of Elitzur's theorem?

Quantum symmetries: $S$ or $Z$?

Does 4D ${\cal N} = 3$ supersymmetry exist?

Faster ways of computing feynman diagrams

Why we can't write low energy effective field theory for a gapless system?

A simple question about the scattering amplitude $\mathcal{M}$ in QFT

Energy of quarks and the mass of the proton