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| bio | website | |
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| location | ||
| age | ||
| visits | member for | 2 years, 3 months |
| seen | 1 hour ago | |
| stats | profile views | 901 |
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Feb 24 |
awarded | Yearling |
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Feb 18 |
answered | Spontaneous breaking of Lorentz invariance in gauge theories |
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Feb 1 |
awarded | research-level |
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Jan 26 |
awarded | Enlightened |
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Jan 26 |
awarded | Nice Answer |
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Dec 30 |
comment |
Path integral with zero energy modes @Greg I can't see your E-mail, instead I placed the copy in a file exchange server, fileconvoy.com/… where it will be abailable in the next 7 days |
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Dec 28 |
comment |
Path integral with zero energy modes @Greg, 1) The unitary transformation U does not need to preserve $\mathrm{ker}(D)$, sorry for not emphasizing that one must project on the top form after performing the action, because the top form subspace is one dimensional. I'll try to add in a few days an explicit computation of the scalar multiple and the cocycle condition. 2) I'll be happy to help if you need me to send a copy of the article. |
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Dec 26 |
answered | Path integral with zero energy modes |
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Dec 23 |
comment |
Classical vs. Quantum use of the spin 4-vector Sorry for the late response, I added an update explaining the ultra-relativistic case. |
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Dec 23 |
revised |
Classical vs. Quantum use of the spin 4-vector added 1138 characters in body |
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Dec 21 |
comment |
Classical vs. Quantum use of the spin 4-vector The boost transformation of the spatial components of the Pauli Lubanski vector is the third equation copied from the reference article. For a massive particle, the spin is the value of the spatial component vector at its rest frame. Knowing the momentum and the Pauli-Lubanski vector, one can perform a boost to a frame where the particle is at rest and get its spin. In a frame where the particle is not at rest the spatial components of the Pauli Lubanski vector still satisfy the spin commutation relations since they are composed from the spin and an angular momentum, thus should be quantized. |
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Dec 20 |
comment |
Classical vs. Quantum use of the spin 4-vector Basically, yes, but please notice that the spatial spin components in the rest frame satisfy the angular momentum commutation relations, and the x and z components cannot be measured simultinuously. Thus the numerical values of the Pauli- Lubanski vector should be understood as expectations. |
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Dec 19 |
revised |
Classical vs. Quantum use of the spin 4-vector added 1 characters in body |
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Dec 19 |
answered | Classical vs. Quantum use of the spin 4-vector |
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Dec 13 |
revised |
few fermions in a harmonic trap — position density matrix from diagrammatics edited body |
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Dec 13 |
answered | few fermions in a harmonic trap — position density matrix from diagrammatics |
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Dec 11 |
comment |
Beyond WKB approximation for energies @Emilio You may find these lecture note by B.C. Hall useful: math.cinvestav.mx/~NorteSur/Taller10/notas/Hall.pdf |
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Dec 10 |
answered | Beyond WKB approximation for energies |
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Dec 6 |
awarded | Necromancer |
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Dec 3 |
answered | Other Gross-Neveu like theories? |
