User Tobias Kienzler

55

92

votes

10

answers

13k

views

Is there something similar to Noether's theorem for discrete symmetries?

Oct 1 '19 at 23:35 Geremia 1,938

32

51

votes

9

answers

6k

views

Is a “third quantization” possible?

quantum-field-theory quantization second-quantization

Mar 18 '15 at 13:19 Community♦ 1

16

43

votes

5

answers

3k

views

Is the world $C^\infty$?

quantum-field-theory analyticity

Nov 26 at 16:23 Andreas Mastronikolis 642

14

42

votes

17

answers

5k

views

Why does one experience a short pull in the wrong direction when a vehicle stops?

newtonian-mechanics jerk

Jul 28 '16 at 15:15 Community♦ 1

20

19

votes

4

answers

4k

views

If all conserved quantities of a system are known, can they be explained by symmetries?

mathematical-physics symmetry noethers-theorem conservation-laws integrals-of-motion

Jun 23 at 9:23 Qmechanic♦ 138k

9

19

votes

1

answer

4k

views

What is the definition of how to count degrees of freedom?

definition degrees-of-freedom

Mar 30 at 18:49 Qmechanic♦ 138k

2

19

votes

2

answers

346

views

Can symmetry generators be used for quantization?

quantum-field-theory mathematical-physics symmetry group-theory quantization

Jan 3 '13 at 12:27 Dilaton 8,839

4

14

votes

2

answers

605

views

What colour is an electron?

electromagnetic-radiation quantum-electrodynamics non-linear-optics

Mar 1 '19 at 3:14 KF Gauss 4,578

2

14

votes

3

answers

726

views

Are there models/simulations of antigravitational antimatter-galaxies?

gravity simulations antimatter galaxies models

Jan 26 '16 at 0:34 Community♦ 1

1

13

votes

2

answers

1k

views

Is a neutron star basically an isotope?

neutrons neutron-stars isotopes

Sep 13 '15 at 20:12 pathintegral 1,211

3

12

votes

3

answers

1k

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Does the concept of a “momenton” make sense?

quantum-field-theory operators momentum quantum-gravity second-quantization

Nov 23 at 21:02 MadMax 2,723

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8

votes

1

answer

1k

views

Imaginary time is to inverse temperature what imaginary entropy is to …?

time temperature entropy complex-numbers wick-rotation

Oct 26 '14 at 1:42 Nathaniel 30.2k

1

7

votes

2

answers

541

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Why does $\mathcal L = -\frac14 F^{\mu\nu} F_{\mu\nu}$ imply Photons are massless?

particle-physics photons group-theory group-representations

Jul 31 '14 at 18:50 Tobias Kienzler 6,103

3

6

votes

1

answer

765

views

How to correctly calculate the colour of the sky?

optics electromagnetic-radiation scattering atmospheric-science sun

May 12 '19 at 17:02 Community♦ 1

1

6

votes

2

answers

347

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Is Quantum Coulomb still singular?

quantum-mechanics electromagnetism charge singularities coulombs-law

Sep 10 '15 at 8:28 Tobias Kienzler 6,103

4

votes

2

answers

5k

views

How to measure Entropy?

entropy measurements

May 20 '15 at 13:32 Kyle Kanos 23.4k

4

votes

1

answer

101

views

A nice overview (and maybe derivation) of the Poincaré transformations of the Vector Spherical Harmonics

research-level specific-reference group-representations poincare-symmetry spherical-harmonics

Jan 27 '13 at 16:00 Dilaton 8,839

1

3

votes

1

answer

892

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Is the Gibbs-Duhem equation always valid?

thermodynamics potential

Mar 22 '15 at 20:24 Community♦ 1

0

votes

1

answer

83

views

How linearly additive are the x-ray mass attenuation coefficients for molecules?

absorption x-rays attenuation

Aug 5 '18 at 9:34 imabug 483

0

votes

2

answers

179

views

Does time pass fastest in isolated, resting space?

general-relativity time vacuum

Feb 21 '17 at 5:52 Anixx 9,170

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20 Questions

Is there something similar to Noether's theorem for discrete symmetries?

Is a “third quantization” possible?

Is the world $C^\infty$?

Why does one experience a short pull in the wrong direction when a vehicle stops?

If all conserved quantities of a system are known, can they be explained by symmetries?

What is the definition of how to count degrees of freedom?

Can symmetry generators be used for quantization?

What colour is an electron?

Are there models/simulations of antigravitational antimatter-galaxies?

Is a neutron star basically an isotope?

Does the concept of a “momenton” make sense?

Imaginary time is to inverse temperature what imaginary entropy is to …?

Why does $\mathcal L = -\frac14 F^{\mu\nu} F_{\mu\nu}$ imply Photons are massless?

How to correctly calculate the colour of the sky?

Is Quantum Coulomb still singular?

How to measure Entropy?

A nice overview (and maybe derivation) of the Poincaré transformations of the Vector Spherical Harmonics

Is the Gibbs-Duhem equation always valid?

How linearly additive are the x-ray mass attenuation coefficients for molecules?

Does time pass fastest in isolated, resting space?