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  • 0 posts edited
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  • 21 votes cast
Sep
13
asked How is the Saddle point approximation used in physics?
Aug
31
comment Where can a good treatment of the 'sudden' perturbation approximation be found?
Thanks for the suggestion. It has been translated to English and is on Amazon. Just ordered it from the library.
Aug
31
asked Where can a good treatment of the 'sudden' perturbation approximation be found?
Aug
14
comment parallel/anti-parallel vs. triplet/singlet description of two spins
Here is my problem then. Consider a single spin $\uparrow$ at a site. Now bring in another spin. In the first basis you write, there is a 50 % that the added spin can coexist at the site since there is a 50 % chance it will be anti-parallel (so by Pauli exclusion). In the second basis, it would be a 75 % chance they could exist on the same site since there is a 75 % chance they will form triplet state. Where am I wrong here?
Aug
14
asked parallel/anti-parallel vs. triplet/singlet description of two spins
Jun
25
comment generalizing spin rotations
Thanks @PeterMorgan. Yes, I see now that the type of operator would be important. I am thinking of two spins so the matrix would be another spin operator so $\vec{S} \cdot \vec{I}$ where S and I commute but the eigenvalues would not be +/-1
Jun
24
asked generalizing spin rotations
Jun
10
asked Selection rule used in singlet/triplet recombination in LEDs
May
31
asked QM interpretation of Larmor precession
May
10
awarded  Commentator
May
10
comment Paradox of the Relativistic Record Player
yes, I see this has basically been answered in the link provided by @Lagerbaer. Is the correct protocol to now delete this question?
May
10
asked Paradox of the Relativistic Record Player
May
8
comment Limit of Lorentzian is Dirac Delta
thanks for the answer. So since the expression in question is NOT a form for the Delta function, it will be zero even if t=0. Is that right?
May
8
comment Limit of Lorentzian is Dirac Delta
thanks for the response. If I understand you correctly, you are also saying that the Lorentzian is a poor choice to define the Delta function by? Anyways, my test function is unity so I suppose I am fine considering 'my' definition to be ok for the Delta function.
May
8
asked Limit of Lorentzian is Dirac Delta
May
5
asked Ohm's Law and Space-Charge Limited Current
Mar
2
comment Kinematics textbook illustration
@noname, What textbook is this?
Mar
2
awarded  Editor
Mar
2
revised Fermi level in disordered amorphous and/or organic semiconductors
added 337 characters in body
Mar
1
asked Fermi level in disordered amorphous and/or organic semiconductors