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May
27
revised If time-like paths are geodesics, what physical principle applies to space-like intervals?
edited title
May
27
asked If time-like paths are geodesics, what physical principle applies to space-like intervals?
May
26
awarded  Notable Question
Apr
8
revised What's the interpretation of Feynman's picture proof of Noether's Theorem?
Corrected wrong logic
Apr
7
accepted How does Dirac define the representative of $\{\langle\phi\frac{d}{dq}\}\psi\rangle = \langle\phi\{\frac{d}{dq}\psi\rangle\}$
Apr
7
comment How does Dirac define the representative of $\{\langle\phi\frac{d}{dq}\}\psi\rangle = \langle\phi\{\frac{d}{dq}\psi\rangle\}$
Archaic notation or not, I'm looking for an answer in the spirit of Dirac's method; but thanks for your effort.
Apr
7
comment How does Dirac define the representative of $\{\langle\phi\frac{d}{dq}\}\psi\rangle = \langle\phi\{\frac{d}{dq}\psi\rangle\}$
Thanks for your effort, but I was hoping for an answer based more around Dirac's procedure. Maybe you could have a quick glance at an online version of his book available on scribd.com? ;)
Apr
3
comment Quantum Mechanics by Dirac
Dirac's book is an introduction to QM for researchers and grad students. It was never used as a text book because he didn't have experience as a teacher of undergraduates and the problems they face; hence there's no exercises in the book. Even Feynman didn't understand Dirac's book when he read it as an undergraduate. The main thing going for it from what I've read is his more abstract view of the subject. Definitely a book only to be read by those with a good understanding of Hamiltonian mechanics and complex vector spaces (which he assumes the reader already knows about)
Dec
15
asked How does Dirac define the representative of $\{\langle\phi\frac{d}{dq}\}\psi\rangle = \langle\phi\{\frac{d}{dq}\psi\rangle\}$
Nov
26
comment EPR Paradox resolution: the spin is fixed at creation but its measurement isn't?
So these states are probabilities of it being measured to have some spin; this doesn't mean the spin upon creation is in a superposition of spin states, does it?
Nov
25
comment EPR Paradox resolution: the spin is fixed at creation but its measurement isn't?
But aren't you using "state" here to mean the probability of what's measured?
Nov
25
asked EPR Paradox resolution: the spin is fixed at creation but its measurement isn't?
Nov
25
awarded  Inquisitive
Nov
24
comment Does the total energy in an electromagnetic field depend on the acceleration of the sources?
@ACuriousMind I'm trying to understand where the self-force for an accelerated charge comes from. Since the self-force increases with acceleration I thought this might be because more electromagnetic energy is created.
Nov
24
revised Does the total energy in an electromagnetic field depend on the acceleration of the sources?
edited title
Nov
24
asked Does the total energy in an electromagnetic field depend on the acceleration of the sources?
Nov
12
comment Will a ball slide down a lumpy hill over the same path it rolls down the hill?
The difficult part is showing that the constraint for no slipping and its angular momentum doesn't affect the path taken by the center of mass when it's allowed to slip.
Nov
10
comment Will a ball slide down a lumpy hill over the same path it rolls down the hill?
@RonMaimon I've done a search on Amazon.com for that reference in your answer, but I can't find it; is it an old rare book?
Nov
1
awarded  Popular Question
Oct
27
accepted How to show that $(\xi\eta-\eta\xi)|A\rangle = 0$?