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xiaohuamao
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50 votes
0 answers
2k views

Can Lee-Yang zeros theorem account for triple point phase transition?

18 votes
1 answer
2k views

Does magnetic monopole violate $U(1)$ gauge symmetry?

14 votes
2 answers
2k views

Why do spin-$\frac{1}{2}$ nuclei have zero electric quadrupole moment?

13 votes
1 answer
927 views

Is Elitzur's theorem valid only in lattice field theory?

10 votes
2 answers
5k views

Why does adjoint representation matter in some field theories?

10 votes
5 answers
2k views

Why does group representation theory look linear?

8 votes
1 answer
3k views

Numerical analytic continuation for Green's function

7 votes
2 answers
552 views

First-principles calculation of the critical temperature of a superconductor

7 votes
1 answer
3k views

How to calculate Zak phase from numerical wavefunctions with arbitray phase?

7 votes
1 answer
222 views

How to dress free Green functions with constant broadening?

6 votes
1 answer
317 views

Is topological surface state always tangential to bulk bands?

6 votes
2 answers
249 views

"Bosons are either gapped or condensated, except physical principle protected cases (Goldstone boson, photon)."?

6 votes
1 answer
1k views

Are they the same thing: Wigner distribution in quantum Boltzmann equation and Wigner function in quantum optics?

6 votes
2 answers
2k views

When is quasiparticle same as elementary excitation, and when is not?

5 votes
2 answers
662 views

Do we have a quantum field theory of monopoles?

5 votes
1 answer
270 views

Meaning of approximation $\cos(\phi)=\frac{\phi^2}{2}\mathrm{e}^{-\frac{1}{2}\langle{\phi^2}\rangle}$ in a field theory?

5 votes
2 answers
165 views

Does free phonon propagator always vanish at zero momentum?

4 votes
1 answer
92 views

Is self-energy $\mathrm{Im}\Sigma^r<0$ always true?

4 votes
0 answers
469 views

Matsubara frequency summation when residue theorem is suspicious?

4 votes
0 answers
369 views

Fields with SO(3) diagonal subgroup symmetry

3 votes
2 answers
754 views

Infinitely many degeneracy of Landau level: Countable or Uncountable?

3 votes
1 answer
707 views

Why does total spin conservation law forbid the spin wave gap in Heisenberg magnets?

3 votes
3 answers
271 views

Why can we quantize macro(meso)scopic harmonic oscillator?

3 votes
1 answer
313 views

Group analysis forbids band-crossing in 1D?

3 votes
0 answers
200 views

Can the occupation of Floquet bands be calculated from the Keldysh Green's function?

3 votes
1 answer
217 views

In what circumstances, can exchange interaction acquire temperature dependence?

3 votes
0 answers
232 views

Does nonlocal theory violate causality?

3 votes
1 answer
196 views

Bosonization for unequal left/right Fermi velocities

3 votes
1 answer
241 views

Time reversal of Hall conductivity

3 votes
1 answer
83 views

How to realize Heaviside $\theta(t-t')$ and Dirac $\delta(t-t')$ as matrices in numerics?