user avatar
user avatar
user avatar
John
  • Member for 6 years, 5 months
  • Last seen this week
20 votes
2 answers
4k views

What is "Dynamical phase transition"?

16 votes
5 answers
9k views

How radioactive is uranium?

7 votes
2 answers
615 views

What is the difference between Einstein–Brillouin–Keller (EBK) quantization and Bohr-Sommerfeld quantization?

6 votes
1 answer
255 views

How to solve the 10000th eigenvalue of the anharmonic oscillator?

4 votes
3 answers
1k views

Why can the Clebsch-Gordan coefficients always be chosen real?

4 votes
1 answer
205 views

What will a glass look like in 500 years?

4 votes
0 answers
28 views

Why is the energy of a vortex in a superconductor finite?

3 votes
1 answer
63 views

Turning into superconductivity---continuous or discontinuous?

3 votes
2 answers
242 views

Completeness condition involving continuum states

3 votes
1 answer
78 views

Symmetry of the hamiltonian $H = \frac{1}{2m}p^2 + V(r) + a \, \vec{s} \cdot \vec{l} $

2 votes
1 answer
147 views

Is there really no transverse sound wave in air? [duplicate]

2 votes
1 answer
28 views

Confusion about the action variable definition

2 votes
1 answer
142 views

Degeneracy of $\left|\pm k\right\rangle $: because of reflection symmetry or time reversal symmetry?

2 votes
0 answers
46 views

Different solutions of the harmonic oscillator

1 vote
0 answers
26 views

Question about the so-called upper critical dimension

1 vote
1 answer
238 views

Question about the Luttinger liquid

1 vote
1 answer
162 views

Field theory on a lattice, what is this?

1 vote
0 answers
158 views

Is there sound diffraction grating? [closed]

1 vote
1 answer
453 views

Why is the electric component of a light field more important than the magnetic component? [duplicate]

1 vote
2 answers
171 views

Why is the sound channel in the ocean especially good for low frequency sound?

1 vote
1 answer
95 views

Why do the KAM tori divide the phase space into disjoint parts in $d\leq 2$ systems?

1 vote
1 answer
106 views

A derivation problem about the Lewis-Riesenfeld theory

1 vote
0 answers
53 views

periodic orbits in Gutzwiller's trace formula

1 vote
0 answers
239 views

Normalizable eigenvectors of the inverted harmonic oscillator

0 votes
2 answers
135 views

Derivation of a commutator in the Luttinger liquid theory

0 votes
1 answer
134 views

Example of integrable time-dependent one degree-of-freedom Hamiltonian system?

0 votes
0 answers
259 views

About the current-current correlator

0 votes
0 answers
100 views

Wannier's solution of the Landau-Zener problem

0 votes
3 answers
99 views

Sign of $(\partial T /\partial V )_E$

0 votes
0 answers
136 views

Eigenstates and eigenvalues of the operator $xp+ px$ [duplicate]