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103 votes
9 answers
28k views

Which is stronger, a rope without knots or a rope with knots?

45 votes
3 answers
8k views

What role does "spontaneous symmetry breaking" play in the "Higgs Mechanism"?

44 votes
5 answers
7k views

Where does deleted information go?

23 votes
3 answers
14k views

Why the statement "there exist at least one bound state for negative/attractive potential" doesn't hold for 3D case?

16 votes
2 answers
6k views

How to obtain the explicit form of Green's function of the Klein-Gordon equation?

13 votes
4 answers
5k views

How is Meissner effect explained by BCS theory?

12 votes
2 answers
47k views

Green dot on photos when taking photo facing the sun

11 votes
2 answers
4k views

Floquet quasienergy spectrum, continuous or discrete?

10 votes
1 answer
7k views

What is the difference between classical and quantum Ising model?

10 votes
3 answers
3k views

Quantum Hall Effect: Why the spikes of the longitudinal resistance appear every time when Hall conductance jumps?

9 votes
2 answers
517 views

The idea of analytical continuation method to solve the Klein-Gordon equation, how and why?

8 votes
2 answers
654 views

Is it possible that we have a physical state which is a mixture of discrete eigenstates and continuous ones?

8 votes
1 answer
983 views

Why doesn't topological phase transition break any symmetry? Hidden symmetry?

8 votes
1 answer
498 views

Superconductivity in graphene with spin orbital coupling, is it proper to let the order parameter on two sub-lattice equal?

6 votes
1 answer
347 views

Will all physical quantities unchanged by this transformation?

6 votes
1 answer
522 views

How to derive electron number equation of Bogoliubov Hamiltonian using thermodynamic relations.

6 votes
0 answers
294 views

Can different Floquet replicas be distinguished (within Floquet's theorem)?

6 votes
2 answers
1k views

Confusion about second-order phase transition between Ehrenfest classification and modern classification

6 votes
2 answers
2k views

How to write BdG Hamiltonian in graphene?

5 votes
1 answer
714 views

If BdG Hamiltonian has particle-hole redundancy, how can it be trusted in discussing the topological properties of superconductors?

5 votes
3 answers
756 views

Is the ground state closest to the uncertainty relation? [duplicate]

5 votes
2 answers
5k views

Landau level degeneracy in symmetry gauge, finite system

4 votes
0 answers
398 views

Precisely speaking, does photon become massive or the phonon become massive, due to Higgs mechanism in superconductor?

4 votes
0 answers
205 views

The wavefunction of the superconductor A consists of two parts: B and C

4 votes
0 answers
2k views

How to show time reversal symmetry does not break in the tight binding Hamiltonian for the honeycomb lattice?

4 votes
1 answer
570 views

Gauge transformation for Bloch waves?

4 votes
1 answer
262 views

Why is the surface integral ignored when deriving the current equation from Ginzburg-Landau theory?

4 votes
1 answer
108 views

Will water be superconducting if add enough pressure?

3 votes
2 answers
394 views

Why need non-degeneracy in this theorem?

3 votes
0 answers
91 views

How to coordinate transform this Lagrangian? [closed]