User Emilio Pisanty

301 votes

2 answers

28k views

What is Chirped Pulse Amplification, and why is it important enough to warrant a Nobel Prize?

asked Oct 2, 2018 at 17:27

107 votes

6 answers

28k views

What is the physical meaning of commutators in quantum mechanics?

asked Aug 13, 2014 at 11:23

70 votes

2 answers

4k views

What are the proposed realizations in the New SI for the kilogram, ampere, kelvin and mole?

asked Nov 18, 2014 at 14:37

57 votes

3 answers

3k views

Are there exact analytical solutions to the electronic states of the hydrogen molecular ion $\mathrm H_2^+$?

asked Jul 4, 2016 at 20:26

52 votes

2 answers

2k views

Can we infer the existence of periodic solutions to the three-body problem from numerical evidence?

asked Nov 6, 2013 at 14:52

40 votes

2 answers

29k views

Square bracket notation for dimensions and units: usage and conventions

asked Sep 17, 2013 at 20:41

39 votes

1 answer

2k views

Why are pear-shaped nuclei possible?

asked Sep 5, 2013 at 15:53

39 votes

2 answers

5k views

What's the deal with momentum in the infinite square well?

asked Oct 11, 2017 at 17:52

37 votes

3 answers

2k views

Is it possible to speak about changes in a physical constant which is not dimensionless?

asked Sep 26, 2013 at 18:10

35 votes

5 answers

3k views

Do free-electron lasers actually lase?

asked Jan 6, 2016 at 22:39

33 votes

6 answers

18k views

Fundamental invariants of the electromagnetic field

asked Nov 25, 2013 at 11:58

33 votes

3 answers

3k views

Eigenfunctions of the Runge-Lenz vector

asked Dec 9, 2013 at 21:05

29 votes

5 answers

5k views

Is there a simple proof that Kirchhoff's circuit laws always provide an exactly complete set of equations?

asked Feb 18, 2015 at 12:57

27 votes

1 answer

2k views

Why do quasicrystals have well-defined Fourier transforms?

asked Oct 30, 2013 at 16:54

25 votes

2 answers

3k views

Can one force the electric quadrupole moments of a neutral charge distribution to vanish using a suitable translation?

asked Jan 9, 2013 at 17:59

25 votes

3 answers

1k views

What symmetry is associated with conservation of Lipkin's zilch?

asked Dec 14, 2015 at 14:11

24 votes

1 answer

3k views

The choice of measurement basis on one half of an entangled state affects the other half. Can this be used to communicate faster than light?

asked Feb 25, 2014 at 19:10

22 votes

1 answer

2k views

What are the proposed theoretical explanations for the EmDrive?

asked May 22, 2015 at 17:08

22 votes

1 answer

3k views

How does one account for the momentum of an absorbed photon?

asked Oct 14, 2015 at 22:54

22 votes

1 answer

2k views

In Floquet theory, what is the physical significance of the Fourier coefficients?

asked Oct 4, 2016 at 18:04

21 votes

3 answers

877 views

How do coherent isotropic radiators evade the hairy-ball theorem?

asked Feb 13, 2017 at 12:52

21 votes

2 answers

5k views

What do the names "E mode" and "B mode" mean? Where do they come from?

asked Mar 18, 2014 at 11:12

20 votes

1 answer

2k views

What's the difference between a realization, a representation and an implementation in metrology?

asked Aug 11, 2016 at 17:43

18 votes

5 answers

709 views

Can I swap quantum mechanical ground state for some classical trajectory distribution and have it sit still after the swap?

asked Aug 17, 2016 at 14:33

18 votes

5 answers

816 views

Is the Moyal-Liouville equation $\frac{\partial \rho}{\partial t}= \frac{1}{i\hbar} [H\stackrel{\star}{,}\rho]$ used in applications?

asked Dec 7, 2017 at 13:43

18 votes

2 answers

1k views

Are orbitals observable physical quantities in a many-electron setting?

asked Dec 18, 2015 at 17:19

17 votes

3 answers

3k views

$p\ \text dq$ is the "tautological" one-form?

asked Dec 4, 2013 at 2:20

17 votes

2 answers

2k views

Must magnetic field lines close upon themselves or go to infinity?

asked Feb 10, 2017 at 14:17

16 votes

1 answer

457 views

Do Franck-Condon oscillations have natural lineshapes?

asked Jul 19, 2013 at 16:56

16 votes

3 answers

2k views

Reference request: Susskind-Glogower original paper

asked Apr 11, 2012 at 11:25

Stack Exchange Network

146 Questions

What is Chirped Pulse Amplification, and why is it important enough to warrant a Nobel Prize?

What is the physical meaning of commutators in quantum mechanics?

What are the proposed realizations in the New SI for the kilogram, ampere, kelvin and mole?

Are there exact analytical solutions to the electronic states of the hydrogen molecular ion $\mathrm H_2^+$?

Can we infer the existence of periodic solutions to the three-body problem from numerical evidence?

Square bracket notation for dimensions and units: usage and conventions

Why are pear-shaped nuclei possible?

What's the deal with momentum in the infinite square well?

Is it possible to speak about changes in a physical constant which is not dimensionless?

Do free-electron lasers actually lase?

Fundamental invariants of the electromagnetic field

Eigenfunctions of the Runge-Lenz vector

Is there a simple proof that Kirchhoff's circuit laws always provide an exactly complete set of equations?

Why do quasicrystals have well-defined Fourier transforms?

Can one force the electric quadrupole moments of a neutral charge distribution to vanish using a suitable translation?

What symmetry is associated with conservation of Lipkin's zilch?

The choice of measurement basis on one half of an entangled state affects the other half. Can this be used to communicate faster than light?

What are the proposed theoretical explanations for the EmDrive?

How does one account for the momentum of an absorbed photon?

In Floquet theory, what is the physical significance of the Fourier coefficients?

How do coherent isotropic radiators evade the hairy-ball theorem?

What do the names "E mode" and "B mode" mean? Where do they come from?

What's the difference between a realization, a representation and an implementation in metrology?

Can I swap quantum mechanical ground state for some classical trajectory distribution and have it sit still after the swap?

Is the Moyal-Liouville equation $\frac{\partial \rho}{\partial t}= \frac{1}{i\hbar} [H\stackrel{\star}{,}\rho]$ used in applications?

Are orbitals observable physical quantities in a many-electron setting?

$p\ \text dq$ is the "tautological" one-form?

Must magnetic field lines close upon themselves or go to infinity?

Do Franck-Condon oscillations have natural lineshapes?

Reference request: Susskind-Glogower original paper