User Arturo don Juan

12 votes

1 answer

1k views

Why must inertial mass and gravitational mass be equal, not just proportional?

asked Oct 13, 2015 at 23:58

9 votes

4 answers

1k views

Maxwell Equations don't give unique Electric Field?

electromagnetism magnetic-fields electric-fields maxwell-equations dirac-delta-distributions

asked Jan 26, 2016 at 6:50

9 votes

2 answers

1k views

Why are symmetry transformations connected to the identity necessarily represented by linear unitary operators?

quantum-mechanics operators hilbert-space group-representations unitarity

asked Dec 19, 2017 at 17:21

9 votes

1 answer

234 views

Questions about the large-instanton problem

quantum-field-theory path-integral instantons lattice-gauge-theory

asked Apr 29, 2020 at 21:32

9 votes

2 answers

460 views

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

quantum-field-theory propagator wick-rotation analyticity

asked Jan 19 at 6:38

8 votes

1 answer

362 views

How can phonons possibly be assigned precise locations?

statistical-mechanics phonons

asked Nov 7, 2017 at 23:18

8 votes

3 answers

5k views

Einstein's first postulate implies the second?

special-relativity speed-of-light inertial-frames relative-motion

asked Jan 22, 2015 at 4:30

7 votes

1 answer

611 views

How do scientists measure the spin-parity of a resonance?

quantum-mechanics particle-physics nuclear-physics

asked Feb 2, 2015 at 16:46

7 votes

2 answers

11k views

Killing Vectors in Schwarzschild Metric

general-relativity symmetry metric-tensor vector-fields

asked Oct 25, 2015 at 3:44

7 votes

2 answers

219 views

Does the path of a Wilson line in a quark-correlator matter?

quantum-field-theory quantum-chromodynamics wilson-loop parton

asked Mar 10, 2020 at 4:32

6 votes

2 answers

2k views

How is the Poisson bracket $\{\mathbf{c},\mathbf{l}\cdot\hat{n}\}=(\hat{n}\times \mathbf{c})$, for constant $\mathbf{c}$, and not zero?

classical-mechanics poisson-brackets

asked Feb 22, 2016 at 4:28

6 votes

1 answer

2k views

Lower bound on energy is potential minimum

quantum-mechanics energy operators potential-energy hamiltonian

asked Mar 24, 2016 at 15:25

6 votes

2 answers

1k views

What is the purpose of the Maxwell Stress Tensor?

electromagnetism stress-energy-momentum-tensor stress-strain

asked Apr 1, 2016 at 17:34

6 votes

1 answer

7k views

Divergence of Cauchy Stress Tensor [closed]

material-science stress-energy-momentum-tensor continuum-mechanics stress-strain navier-stokes

asked Nov 5, 2014 at 0:59

5 votes

1 answer

3k views

How do scientists estimate elemental-abundance in the universe?

astronomy astrophysics nuclear-physics elements

asked Nov 18, 2014 at 23:49

5 votes

3 answers

47k views

What is a good definition of 'time'? [duplicate]

time

asked Jan 2, 2015 at 5:32

5 votes

1 answer

2k views

What does 'channel' mean?

particle-physics experimental-physics nuclear-physics terminology data

asked Jan 20, 2015 at 2:46

5 votes

2 answers

1k views

Stress Force - Understanding Cauchy Stress Tensor

classical-mechanics tensor-calculus stress-energy-momentum-tensor continuum-mechanics navier-stokes

asked Nov 4, 2014 at 18:01

5 votes

1 answer

231 views

What is a "stochastic web"?

hamiltonian-formalism chaos-theory phase-space complex-systems integrable-systems

asked Jul 1, 2016 at 1:31

5 votes

1 answer

1k views

I tested the RLC circuit natural frequency formula, and I'm getting the exact opposite result. Why?

electric-circuits linear-systems

asked Apr 4, 2018 at 18:02

5 votes

0 answers

194 views

Is there an equation of state for a non-ideal Fermi gas?

electromagnetism thermodynamics statistical-mechanics condensed-matter

asked Oct 4, 2016 at 21:08

4 votes

3 answers

519 views

Is the wavefunction unique to the observer?

quantum-mechanics wavefunction quantum-interpretations observers bells-inequality

asked Dec 6, 2016 at 0:37

4 votes

1 answer

6k views

Trace of density matrix for mixed state

quantum-mechanics homework-and-exercises density-operator trace

asked Oct 31, 2016 at 17:25

4 votes

3 answers

2k views

How do you physically measure voltage and current?

experimental-physics measurements

asked Mar 7, 2018 at 16:32

4 votes

1 answer

134 views

When was the phrase "beta function" of renormalization first used?

quantum-field-theory terminology renormalization notation history

asked Oct 19, 2018 at 15:59

4 votes

1 answer

677 views

How do we know -273.15 centigrade is 0 kelvin?

thermodynamics temperature

asked Sep 16, 2016 at 17:40

4 votes

0 answers

185 views

Importance of energy relation in Landau & Lifschitz "Statistical Physics"?

thermodynamics statistical-mechanics entropy adiabatic

asked Sep 17, 2016 at 0:39

4 votes

3 answers

3k views

Why don't E&M fields change orientation after hitting a surface?

electromagnetism electromagnetic-radiation reflection polarization boundary-conditions

asked Apr 24, 2016 at 17:26

4 votes

0 answers

98 views

Gaussian Minimizes Uncertainty - Statement Qualification [duplicate]

quantum-mechanics operators heisenberg-uncertainty-principle

asked Apr 25, 2016 at 21:45

4 votes

1 answer

256 views

Are there fifth-kind and sixth-kind generating functions?

classical-mechanics hamiltonian-formalism

asked Jan 13, 2016 at 6:07

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133 Questions

Why must inertial mass and gravitational mass be equal, not just proportional?

Maxwell Equations don't give unique Electric Field?

Why are symmetry transformations connected to the identity necessarily represented by linear unitary operators?

Questions about the large-instanton problem

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

How can phonons possibly be assigned precise locations?

Einstein's first postulate implies the second?

How do scientists measure the spin-parity of a resonance?

Killing Vectors in Schwarzschild Metric

Does the path of a Wilson line in a quark-correlator matter?

How is the Poisson bracket $\{\mathbf{c},\mathbf{l}\cdot\hat{n}\}=(\hat{n}\times \mathbf{c})$, for constant $\mathbf{c}$, and not zero?

Lower bound on energy is potential minimum

What is the purpose of the Maxwell Stress Tensor?

Divergence of Cauchy Stress Tensor [closed]

How do scientists estimate elemental-abundance in the universe?

What is a good definition of 'time'? [duplicate]

What does 'channel' mean?

Stress Force - Understanding Cauchy Stress Tensor

What is a "stochastic web"?

I tested the RLC circuit natural frequency formula, and I'm getting the exact opposite result. Why?

Is there an equation of state for a non-ideal Fermi gas?

Is the wavefunction unique to the observer?

Trace of density matrix for mixed state

How do you physically measure voltage and current?

When was the phrase "beta function" of renormalization first used?

How do we know -273.15 centigrade is 0 kelvin?

Importance of energy relation in Landau & Lifschitz "Statistical Physics"?

Why don't E&M fields change orientation after hitting a surface?

Gaussian Minimizes Uncertainty - Statement Qualification [duplicate]

Are there fifth-kind and sixth-kind generating functions?