David Bar Moshe

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|             |                  | bio     | visits   |             |                   |
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|             | 7,647 reputation | website |          | member for  | 2 years, 2 months |
| 1924 badges | location         |         | seen     | 8 hours ago |                   |

128 Comments

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| Nov14 | comment | Gauge symmetry is not a symmetry?Cont. Thus this current is conserved when the gauge field satisfies its equation of motion, the matter field needs not satisfy its equation of motion for the conservation.  Thus, one may say that the current conservation requires only the gauge fields to be on-shell. But this is not the whole story; the time component of the gauge field equations of motion is the Bianchi identity (or the Gauss law).                                                                                                                             |
| Nov14 | comment | Gauge symmetry is not a symmetry?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Nov13 | comment | Majorana-like representation for mixed symmetric states?@ Piotr I have only a partial answer for your question. I am adding an update to the previous answer trying to explain this point.                                                                                                                                                                                                                                                                                                                                                                                      |
| Nov13 | comment | Geometric quantization of identical particles@Squark Thank you for your answer                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Nov9  | comment | Geometric quantization of identical particles@Dan Thanks, your remark is very helpful. I guess that the orbifold fundamental group should be the relevant object to the orbifold quantization.                                                                                                                                                                                                                                                                                                                                                                                  |
| Nov9  | comment | Geometric quantization of identical particlesThank you for your answer and reference                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Oct25 | comment | Edge theory of FQHE - Unable to produce Green's function from anticommutation relations and equation of motion?                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Oct25 | comment | Edge theory of FQHE - Unable to produce Green's function from anticommutation relations and equation of motion?                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Oct21 | comment | Which exact solutions of the classical Yang-Mills equations are known?If you allow the function $f$ to be time dependent $f(r,t)$, it is known that this Ansatz admits regular solutions. I couldn't find references for these solutions, but I think that it is no to hard to reproduce them.                                                                                                                                                                                                                                                                                  |
| Oct10 | comment | Covariant derivatives                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Oct10 | comment | Orbits of maximally entangled mixed statesThanks for the remark. The criterion for maximal entanglement that I have in mind (and didn't spell out explicitely in the question) is the one given by Bengtsson (in the second reference) following equation (22), namely,a state within a given orbit (of the biparticle density matrix) is to be called maximally entangled if its partial trace with respect to system 2 is maximally mixed (maximal Von Neumann entropy) relative to all states within the same orbit. I'll write an update to the question for clarification. |
| Sep21 | comment | Galilean invariance of classical lagrangian                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Sep21 | comment | Galilean invariance of classical lagrangianJohn, The relativistic free particl Lagrangian  L = -mc^2\sqrt{1-\frac{v^2}{c^2}} is not Lorentz invariant, only the full action $S = \int L dt$, where the noninvariance of $dt$ cancels that of the Lagrangian. In the nonrelativistic limit we take the small speed limit but in addition we assume the time is invariant, this is technically the reason why the invariance is lost.                                                                                                                                            |
| Sep19 | comment | Trouble with constrained quantization (Dirac bracket)@Greg,if you change the relative sign between the derivative terms, you would have got an interesting problem, where one can exercise the treatment of Dirac's first class constraints, or equivalently symplectic reduction or the projection onto the lowest landau level.                                                                                                                                                                                                                                               |
| Sep13 | comment | Equivalence of canonical quantization and path integral quantization@Greg, Thank you, Please be free to accept other answers, I don't mind. I don't know exactly what is the new question that you have in mind. If I have information beyond what I wrote here, it will be my pleasure to try to answer your new question.                                                                                                                                                                                                                                                     |
| Sep11 | comment | Equivalence of canonical quantization and path integral quantization@Greg I have added an update trying to answer the questions in your comment.                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Aug23 | comment | How does the quantum path integral relate to the quantization of energy?@Piotr The form in which the "sum over states" is written is just illustrative, of course, if continuous spectrum is  present, we should write an integral over the spectral projectors. What I wanted to emphasize is that we can detect the presence of discrete spectrum by observing the presence of Dirac "peaks" in the Fourier transform of the evolution kernel computed by means of a path integral.                                                                                           |
| Aug23 | comment | The quantized energy level E depends on which power of n?@ David Zaslavsky - I deleted the answer using the delete option at the bottom of the page, I hope that's the right way to do this                                                                                                                                                                                                                                                                                                                                                                                     |
| Aug22 | comment | The quantized energy level E depends on which power of n?Thanks @Nic, corrected                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Aug13 | comment | In quantum mechanics, given certain energy spectrum can one generate the corresponding potential?                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
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