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Nov
28
comment Is there uncertainity of position of the perfectly homogenous radiating body?
I don't understand your question. All measurements have some uncertainty associated with them. For example, if it is a faint source, there is Poisson noise.
Nov
11
comment Why does the measurement of some observable $A$, the measured value is always an eigenvalue of the operator?
Its essentially an axiom of quantum mechanics.
Nov
3
comment How do we physically apply the operators of quantum mechanics on a particle?
As stressed by @AlfredCentauri your question is somewhat confused. A measurement does not correspond to operating on a state with the associated quantities operator.
Nov
3
comment How do we physically apply the operators of quantum mechanics on a particle?
OK, I think I see what you mean, but I still maintain that last paragraph is a bit unclear and the answer would probably be better with the last paragraph removed.
Nov
3
comment How do we physically apply the operators of quantum mechanics on a particle?
@AlfredCentauri The last phrase "but which value will be measured is not determined by the state" is not quite right. I think you should rather say "but which value will be measured has a probability which is determined by the state"
Nov
1
comment How do we physically apply the operators of quantum mechanics on a particle?
In practice I don't think one usually does measure it in that way. Although quantum mechanics of course is perfectly correct, there is not always a straightforward correspondence between the basic theory and what is done in practice. Generally, the momentum of a charged particle is done by measuring it radius of curvature in a known magnetic field. If you want to prepare a particle in a particular momentum state this can be done by having two parallel plates with a small hole in each of them so the particle has to be traveling in a straight line between the holes to get out.
Oct
31
comment What is the mystery of turbulence?
I agree with your answer and am mystified by these supposed quotes from wikipedia: "According to an apocryphal story, Werner Heisenberg was asked what he would ask God, given the opportunity. His reply was: "When I meet God, I am going to ask him two questions: Why relativity? And why turbulence? I really believe he will have an answer for the first."[4] A similar witticism has been attributed to Horace Lamb (who had published a noted text book on Hydrodynamics)—his choice being quantum electrodynamics (instead of relativity) and turbulence. " I hope they were joking!
Sep
25
revised Lorentz transformations and gamma matrices
minor edit
Sep
25
asked Lorentz transformations and gamma matrices
Sep
22
awarded  Popular Question
Sep
17
comment Origin of cusps in simulated dark matter halos
I think those extra comments are not in line with stack exchange conventions and I suggest you remove them.
Sep
16
comment Is there any operator behind probability, in quantum mechanics?
You incorrectly write as though everyone agrees QM has paradoxes.
Sep
9
accepted Degrees of freedom in the early Universe
Sep
9
comment Degrees of freedom in the early Universe
Thanks for the answer. I edited it to explain the modification to the formula further.
Sep
9
suggested rejected edit on Degrees of freedom in the early Universe
Sep
9
revised Degrees of freedom in the early Universe
minor edit
Sep
9
comment Degrees of freedom in the early Universe
Thanks again, your fast!
Sep
9
comment Degrees of freedom in the early Universe
Thanks, just did some of it!
Sep
9
revised Degrees of freedom in the early Universe
added relevant equation
Sep
9
comment Degrees of freedom in the early Universe
I will try to soon. In the mean time, you can right click on the image and choose open in a new window. That will show a zoomed in version.