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J_B_Phys
  • Member for 4 years, 2 months
  • Last seen more than a month ago
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5
Why can you deform the contour in the integral expression for the Klein-Gordon propagator to get the Euclidean propagator?
Dec 22, 2020
4
Are there any results about regularity of the generalized eigenfunctions used in spectral representations of unbounded differential operators?
Mar 18, 2021
3
When can you trust first-order QED?
Mar 2, 2022
3
Is spin associated with rotations or boosts?
Nov 28, 2020
1
Could there exist a situation where a system of electrons is well-described by a classical Dirac field? [duplicate]
Apr 27, 2021
0
How to handle a delta-function divergence from an infinite-dimensional trace of a quantum operator with a general continuous parameter?
Nov 27, 2020
0
A unitary transformation induces a change $\delta\alpha$ on an operator that commutes with a complete set. Why must $\delta\alpha\propto 1$?
Dec 11, 2020
0
Is there any known result about the "average period" of a complicated oscillating function?
Feb 11, 2022
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6
Is $\frac{d^2}{dx^2} + \frac{1}{4}x^2$ Self-Adjoint? Is this argument for it being Self-Adjoint correct?