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Mar
16
comment Differences between eigenstates, bound states and stationary states
just making sure there's no operator discrimination going on here :p.
Mar
16
comment Differences between eigenstates, bound states and stationary states
The eigenvalue $\lambda$ can be complex if $\hat{A}$ is not Hermitian, and there is nothing wrong with non-Hermitian operators and their eigenvalues.
Feb
20
comment Short of collision, can gravity itself kill you?
I thought the same side of the Moon faced the Earth because of conservation of angular momentum?
Feb
16
revised Why do we think Spin is angular momentum as opposed to some other quantity?
minor corrections
Feb
16
suggested approved edit on Why do we think Spin is angular momentum as opposed to some other quantity?
Nov
30
answered Quantum Joke (not a real joke, not a riddle)
Oct
20
awarded  Notable Question
Jun
18
comment Is time a Scalar or a Vector?
@Martin forward, obviously!
May
20
answered Potential step and exponential decay?
May
20
revised What is the physical meaning of $\overline{\Psi} \Psi$ in the Dirac current's “Gordon Decomposition”?
added 90 characters in body
May
20
asked What is the physical meaning of $\overline{\Psi} \Psi$ in the Dirac current's “Gordon Decomposition”?
May
17
awarded  Popular Question
Apr
14
answered How to find references from publications in the physics literature?
Apr
14
comment Can Dark Matter just be clumps of Neutrons
Ok, crazy idea here: is space-time not so distorted inside a black hole that "time stands still"? As in: wouldn't de neutrons inside the black live relatively longer when observed from outside the black hole, due to time dilation? I understand it is difficult or even impossible to talk about the lifetime of a distant object in general relativity sense, but could this idea work at all?
Mar
24
awarded  Peer Pressure
Feb
10
comment How do I properly calculate the curl of the Aharonov-Bohm flux line vector potential?
Of course that is only the $\boldsymbol e_z$ part, the rest is identically zero.
Feb
10
comment How do I properly calculate the curl of the Aharonov-Bohm flux line vector potential?
$\nabla \times \boldsymbol A = \frac{1}{r} \partial_r r \frac{\Phi}{2\pi r} = \frac{\Phi}{2\pi r} \partial_r 1 = 0$. Or something like that.
Feb
10
comment How do I properly calculate the curl of the Aharonov-Bohm flux line vector potential?
Right, and where does the naive approach (i.e. filling in the curl directly) actually go wrong? I'm still unable to pinpoint exactly which step is illegal/wrong and how to perform that step generically in a mathematically correct way. Thanks.
Feb
9
asked How do I properly calculate the curl of the Aharonov-Bohm flux line vector potential?
Jan
30
comment What is the speed of sound in space?
I've always found temperature to lose its usefulness when it comes to either near-vacuum or super-reactive plasma's like the quark-gluon plasma. I just think to much in terms of the pressure a gas exerts or the frequency spectrum a solid emits as temperatue I guess.