User P. C. Spaniel

21 votes

2 answers

5k views

What new features does the Heisenberg Model have compared to the Ising Model?

asked Sep 14, 2016 at 22:29

21 votes

3 answers

4k views

Is the universe non-linear?

asked Dec 19, 2016 at 16:46

16 votes

2 answers

3k views

How do the infinite dimensional representations of the Poincaré group work?

asked Apr 16, 2017 at 18:41

16 votes

3 answers

1k views

Why does Critical Points have fluctuations on all scales (Infinite correlation length)?

asked Oct 1, 2018 at 23:46

16 votes

3 answers

4k views

What is the Spectral Form Factor?

asked May 23, 2019 at 1:15

14 votes

6 answers

2k views

Is the Green function of electromagnetism a scalar or a tensor?

asked Oct 22, 2020 at 20:59

14 votes

1 answer

1k views

Wick rotation vs. Feynman $i\varepsilon$-prescription

asked Jan 29, 2019 at 17:38

10 votes

4 answers

2k views

Does the Hilbert space include states that are not solutions of the Hamiltonian?

asked Sep 17, 2016 at 19:43

9 votes

2 answers

304 views

Can't the Higgs vacuum be a superposition?

asked May 5, 2017 at 2:14

9 votes

4 answers

2k views

Perturbation Theory and Thermodynamic Limit

asked Mar 24, 2018 at 0:47

9 votes

3 answers

2k views

How to write down the collision integral for any interaction in the Boltzmann equation?

asked Jun 25, 2019 at 21:27

9 votes

2 answers

367 views

"No local gauge invariant observables in gravity"... Is it a classical or quantum statement?

asked Oct 13, 2023 at 0:51

8 votes

2 answers

504 views

Horizons and other special surfaces on Kerr metric

asked Apr 17, 2020 at 15:10

8 votes

4 answers

2k views

Third Kepler law and mass dependance

asked Sep 11, 2017 at 21:36

8 votes

1 answer

2k views

Different Schwinger-Dyson Equations

asked Feb 12, 2019 at 20:56

8 votes

2 answers

3k views

Interpretation of the field strength tensor in Yang-Mills Theory

asked Apr 20, 2017 at 4:15

8 votes

1 answer

2k views

Why does the quarks binding energy add mass to nucleons instead of reducing it? [duplicate]

asked Jan 20, 2017 at 21:19

7 votes

1 answer

427 views

Gauge theories, boundaries and Wilson lines

asked Jan 10 at 17:30

6 votes

1 answer

632 views

Question about a 2D Harmonic Oscillator with incommensurate frequencies and Integrability

asked Apr 20, 2020 at 4:49

6 votes

1 answer

373 views

Question about path integral step of the rindler decomposition

asked May 11, 2019 at 23:13

6 votes

0 answers

1k views

Do we know the exact ground state of the Antiferromagnetic Heisenberg Model?

asked Dec 26, 2017 at 20:48

5 votes

2 answers

1k views

Does every regularization/renormalization approach gives running coupling constants?

asked Dec 1, 2017 at 3:52

5 votes

4 answers

2k views

Motivation for the use of 1-forms in General Relativity

asked Jan 28, 2018 at 18:23

5 votes

1 answer

496 views

Different purposes for using the Large-$N$ Expansion

asked May 9, 2019 at 1:22

5 votes

2 answers

1k views

Relation between the trace anomaly and the energy-momentum tensor being off-shell

asked Apr 22, 2019 at 1:14

5 votes

4 answers

325 views

Does any unifying theory explain why nature is Chiral?

asked Apr 12, 2017 at 2:36

5 votes

1 answer

757 views

What's the difference between a post-Minkowskian approximation and a post-Newtonian one?

asked Jan 3, 2020 at 22:18

5 votes

1 answer

384 views

Meaning of "Exactly solvable in the large $N$ limit" for the SYK model

asked May 17, 2019 at 23:31

5 votes

1 answer

330 views

Can we add the resistivity due to different scattering mechanisms?

asked Aug 28, 2019 at 20:29

5 votes

1 answer

235 views

Motivation for introducing ladder operators for the simple harmonic oscillator in quantum mechanics

asked Nov 16, 2023 at 9:08

Stack Exchange Network

151 Questions

What new features does the Heisenberg Model have compared to the Ising Model?

Is the universe non-linear?

How do the infinite dimensional representations of the Poincaré group work?

Why does Critical Points have fluctuations on all scales (Infinite correlation length)?

What is the Spectral Form Factor?

Is the Green function of electromagnetism a scalar or a tensor?

Wick rotation vs. Feynman $i\varepsilon$-prescription

Does the Hilbert space include states that are not solutions of the Hamiltonian?

Can't the Higgs vacuum be a superposition?

Perturbation Theory and Thermodynamic Limit

How to write down the collision integral for any interaction in the Boltzmann equation?

"No local gauge invariant observables in gravity"... Is it a classical or quantum statement?

Horizons and other special surfaces on Kerr metric

Third Kepler law and mass dependance

Different Schwinger-Dyson Equations

Interpretation of the field strength tensor in Yang-Mills Theory

Why does the quarks binding energy add mass to nucleons instead of reducing it? [duplicate]

Gauge theories, boundaries and Wilson lines

Question about a 2D Harmonic Oscillator with incommensurate frequencies and Integrability

Question about path integral step of the rindler decomposition

Do we know the exact ground state of the Antiferromagnetic Heisenberg Model?

Does every regularization/renormalization approach gives running coupling constants?

Motivation for the use of 1-forms in General Relativity

Different purposes for using the Large-$N$ Expansion

Relation between the trace anomaly and the energy-momentum tensor being off-shell

Does any unifying theory explain why nature is Chiral?

What's the difference between a post-Minkowskian approximation and a post-Newtonian one?

Meaning of "Exactly solvable in the large $N$ limit" for the SYK model

Can we add the resistivity due to different scattering mechanisms?

Motivation for introducing ladder operators for the simple harmonic oscillator in quantum mechanics