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seen Nov 3 at 16:27

Nov
2
awarded  Popular Question
Sep
20
revised Is the ground state of a QFT always a pure state? And excited states are mixed?
misspellings corrected
Sep
20
suggested approved edit on Is the ground state of a QFT always a pure state? And excited states are mixed?
Aug
8
comment Does time move slower at the equator?
Related paper
Jul
13
awarded  Popular Question
Jul
12
comment Is there a physical interpretation to invariant random matrix ensembles?
"I did a research related to the question, and can supply you with references" is not an informative answer.
Jul
2
awarded  Curious
Jul
2
comment Does the Bohr van Leeuwen Theorem also apply to ferromagnetism?
The proof presented in your answer applies to "classical" orbital magnetism, not to magnetism caused by intrinsic classical magnetic dipoles.
Jul
1
comment Does the Bohr van Leeuwen Theorem also apply to ferromagnetism?
How about the case where magnetism is produced by classical magnetic dipoles?
Jul
1
comment Which is more fundamental, Fields or Particles?
A related article: There are no particles, there are only fields, Am. J. Phys. 81, 211 (2013) and the comment on it and other citations
Jun
21
comment Why is the computer useful if a chaotic system is sensitive to numeric error?
I would connect the second point with the property called ergodicity, exhibited by some (or many) chaotic systems. If you are interested in some qualitative features and use an energy conserving simulator, it is not a big issue if your numerical simulation diverges from the exact solution, as long as you are on the same energy shell in phase space since the exact solution would cover the whole energy shell anyway.
May
24
revised Is the uncertainty principle a property of elementary particles or a result of our measurement tools?
deleted 5 characters in body
May
24
revised Is the uncertainty principle a property of elementary particles or a result of our measurement tools?
added 410 characters in body
May
24
answered Is the uncertainty principle a property of elementary particles or a result of our measurement tools?
Nov
23
comment Do photons age in a medium?
What is the difference between field velocity and photon velocity? If you quantize a field that propagates with velocity $v<c$, would you still get photons propagating with velocity $c$? How can we see this mathematically?
Nov
21
comment Explaining chirality for spin 1/2 particle
Calling the two states of chirality left and right gives the impression that it has an intuitive meaning similar to helicity, and this intuitive meaning is what I couldn't grasp till now. In nonrelativistic quantum mechanics, the phase associated with rotating around the z-axis depends only on the angle of rotation (the sense of rotation and hence the sign of the phase is encoded in the angle). In relativistic QM, I don't know how this works since I don't know how a relativistic spin operator is defined.
Nov
21
comment Explaining chirality for spin 1/2 particle
Thanks Flip for the answer. It seems from the first part of your answer that you consider chirality just as another quantum number that has different values for particles and anti-particles. Is that true? Otherwise, is it possible to explain chirality without referring to anti-particles at all?
Nov
12
asked Explaining chirality for spin 1/2 particle
Nov
1
awarded  Critic
Sep
22
comment Why doesn't gravity act as a measurement?
A related concept to your question is gravitational decoherence, arxiv.org/abs/gr-qc/0306084