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Faser
  • Member for 6 years, 3 months
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7 votes
Accepted

Prove that if quantum operators $[A, B]$ do not commute then $[A^2, B^2]$ also does not commute

5 votes
Accepted

Squared Summation of Terms using Einstein's summation convention

4 votes

How can you prove this theory wrong?

3 votes
Accepted

What do you call the quantum number $n$ in the wavefunctions of the 1D quantum harmonic oscillator?

3 votes

Explaining why $\mathrm{ d/d}x$ is not Hermitian, but $\mathrm{i~ d/d}x$ is Hermitian

3 votes

Help with Newtonian Gravity as Limit case of General Relativity

2 votes
Accepted

Proof of the Gauge-invariant momentum operator

2 votes
Accepted

Technical question regarding lagrangian and action variation in QFT

1 vote

Negative potential infinite square well

1 vote

A strange requirement on projective representation

1 vote

Geometric meaning of conjugate momentum

1 vote

Hermitian of the Dyson series

1 vote
Accepted

Fermionic occupation for an inhomogeneous tight-binding model

1 vote
Accepted

Going from 2D dispersion relation to density of states

1 vote

Taylor expansion of a scalar function of a four-vector

1 vote

Index problem in change of action under spacetime dependent translation

1 vote

What kind of spin liquids is the Herbertsmithite?

1 vote
Accepted

How to find a linear approximation at a critical point for a potential of a conservative field?

1 vote
Accepted

Time evolution $x(t)$, $p(t)$

0 votes
Accepted

Diagonalizable matrix tight-binding model

0 votes

How to calculate the kinetic energy in field theory when the state is not vacuum state?

-1 votes
Accepted

Can any material be made into a (anti)ferromagnet?