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Nov
5
accepted Is the physics of $j = \rho v$ questionable? What are the consequences?
Nov
4
awarded  Commentator
Nov
4
comment Is the physics of $j = \rho v$ questionable? What are the consequences?
@ACuriousMind It would be the same thing to say that $1/2I\omega^2$ and $1/2 m v^2$ are conceptually different because of the units
Nov
4
comment Is the physics of $j = \rho v$ questionable? What are the consequences?
@ACuriousMind I actually fail to see the reason for them to be different. Perhaps you can help?
Nov
4
asked Is the physics of $j = \rho v$ questionable? What are the consequences?
Oct
1
comment Meaning of the chemical potential for a boson gas
But wasn't it the other way around? i.e. $dE=−PdV+TdS+\mu dN$ and $\mu= +\frac{\partial E}{\partial N}$...
Aug
27
accepted If you dig a deep tunnel, will the rock sublimate?
Aug
26
asked If you dig a deep tunnel, will the rock sublimate?
Aug
23
accepted Is a superposition of (anti)symmetric states (anti)symmetric?
Aug
22
asked Is a superposition of (anti)symmetric states (anti)symmetric?
Jul
17
awarded  Tumbleweed
Jul
10
asked Tricks at manipulating creation/annihilation operators
Jul
2
awarded  Curious
Jun
27
comment Does Earth really have two high-tide bulges on opposite sides?
If that is an oversimplification, how is tidal acceleration correctly described? Wikipedia uses extensively the model of the bulge
Mar
15
accepted What are “parity considerations” in deciding the form of the Hamiltonian?
Mar
14
comment What are “parity considerations” in deciding the form of the Hamiltonian?
Thanks! Now I understood that $\langle g | \hat{z} | g \rangle$ since it is the dot product of two electron states with different parity. I have a new question now (maybe I should start a new topic): shouldn't there be an "overall parity operator" that commutes with $\hat{H}_{el} + \hat{H}_{phot} + \hat{H}_{int}$, since even considering the electromagnetic interaction the overall parity should be conserved.
Mar
13
awarded  Yearling
Mar
13
asked What are “parity considerations” in deciding the form of the Hamiltonian?
Feb
14
accepted Is crystal momentum an operator?
Feb
12
answered Is crystal momentum an operator?