User Arturo don Juan

15 votes

Is there a cutoff for Newtonian gravity?

answered Feb 6 at 2:06

6 votes

Accepted

What are the criteria for a system to follow quantum mechanics instead of classical mechanics?

answered Nov 9, 2017 at 3:22

5 votes

Accepted

Planck's law question

answered May 21, 2021 at 20:48

5 votes

Accepted

Feynman diagrams, can't Wick-rotate due to poles in first and third $p_0$ quadrants?

answered Mar 12, 2022 at 0:16

4 votes

Accepted

A doubt in a Wikipedia article discussing Bertrand's theorem

answered Nov 2, 2021 at 22:52

4 votes

Is there any physical situation where the electric potential is discontinuous?

answered Feb 21 at 21:12

4 votes

Accepted

Value of the total spin quantum number $s$ in a system of two spin-$1/2$ particles

answered May 13, 2021 at 22:04

4 votes

What is polarisation, spin, helicity, chirality and parity?

answered Apr 25, 2020 at 15:24

4 votes

How do we Know Something is a Cross Product?

answered Apr 27, 2020 at 17:23

4 votes

Accepted

Is my book's answer on a cons. of momentum question incorrect?

answered Oct 10, 2017 at 19:05

3 votes

Accepted

Is there a list of hydrogenic transition matrix elements online?

answered Oct 6, 2016 at 4:02

3 votes

Accepted

Rate at which planet "sweeps out area"

answered Nov 3, 2016 at 0:53

3 votes

Is the Momentum Operator a Postulate?

answered Nov 4, 2016 at 1:36

3 votes

Why can't electric potential be negative?

answered Apr 5, 2015 at 5:43

3 votes

Google interview riddle and scaling arguments

answered Apr 8, 2015 at 16:02

3 votes

Accepted

Angular distribution of dipole moments?

answered Sep 26, 2017 at 2:05

3 votes

Accepted

Why external chemical potential?

answered Mar 20, 2018 at 18:21

3 votes

Feynman Propagator for fermionic field $S_F(x-x)=0$

answered Feb 5, 2020 at 19:59

3 votes

Field lines of two bar magnets becoming one bar magnet

answered Feb 1 at 20:36

3 votes

Accepted

Does dark matter exist or not?

answered Jun 3, 2021 at 20:48

3 votes

How can one generally prevent silly mistakes in very long physics calculations?

answered Jan 26, 2022 at 16:06

3 votes

How does the physics of the rotation behaviour of the Roti can be explained?

answered Jan 28, 2022 at 18:22

3 votes

How can an operator be proportional to a scalar?

answered Aug 4, 2022 at 17:49

3 votes

Continuous motion is a myth and the speed of light is a convention

answered Aug 24, 2022 at 23:03

3 votes

Product of delta distributions

answered Oct 6, 2022 at 18:57

2 votes

How to assign a value to an observable when the statevector is not an eigenvector of the operator?

answered Sep 20, 2022 at 18:10

2 votes

Derivation in LSZ Reduction Formula

answered Aug 24, 2022 at 23:26

2 votes

What is the real world interpretation of $E = mc^2$?

answered May 19, 2022 at 20:35

2 votes

Accepted

Why are the poles of the propagator the masses of bound states and not the masses of unbound states as well?

answered Jun 3, 2021 at 22:03

2 votes

Accepted

What are virtual bound states or virtual levels of a finite square well?

answered Jan 20, 2022 at 23:10

Stack Exchange Network

118 Answers

Is there a cutoff for Newtonian gravity?

What are the criteria for a system to follow quantum mechanics instead of classical mechanics?

Planck's law question

Feynman diagrams, can't Wick-rotate due to poles in first and third $p_0$ quadrants?

A doubt in a Wikipedia article discussing Bertrand's theorem

Is there any physical situation where the electric potential is discontinuous?

Value of the total spin quantum number $s$ in a system of two spin-$1/2$ particles

What is polarisation, spin, helicity, chirality and parity?

How do we Know Something is a Cross Product?

Is my book's answer on a cons. of momentum question incorrect?

Is there a list of hydrogenic transition matrix elements online?

Rate at which planet "sweeps out area"

Is the Momentum Operator a Postulate?

Why can't electric potential be negative?

Google interview riddle and scaling arguments

Angular distribution of dipole moments?

Why external chemical potential?

Feynman Propagator for fermionic field $S_F(x-x)=0$

Field lines of two bar magnets becoming one bar magnet

Does dark matter exist or not?

How can one generally prevent silly mistakes in very long physics calculations?

How does the physics of the rotation behaviour of the Roti can be explained?

How can an operator be proportional to a scalar?

Continuous motion is a myth and the speed of light is a convention

Product of delta distributions

How to assign a value to an observable when the statevector is not an eigenvector of the operator?

Derivation in LSZ Reduction Formula

What is the real world interpretation of $E = mc^2$?

Why are the poles of the propagator the masses of bound states and not the masses of unbound states as well?

What are virtual bound states or virtual levels of a finite square well?