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location Europe
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visits member for 4 years, 1 month
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I'm a theoretical physicist.


2h
comment Derivative of the product of operators and Derivative of exponential
Related perturbative formulas: $$e^{-t\hat{A}}e^{t(\hat{A}+\hat{B})}-{\bf 1} ~=~\int_0^t\!ds~e^{-s\hat{A}}\hat{B}e^{s(\hat{A}+\hat{B})}\qquad \Leftrightarrow $$ $$e^{t(\hat{A}+\hat{B})}~=~e^{t\hat{A}} +\int_0^t\!ds~e^{(t-s)\hat{A}}\hat{B}e^{s(\hat{A}+\hat{B})}~=~\ldots .$$
4h
comment “Equidistant” spectra in quantum mechanics
Possible duplicate: physics.stackexchange.com/q/132688/2451
12h
comment Why do electric field lines start and end at 90 degree at the surface of a conductor?
Possible duplicates: physics.stackexchange.com/q/74456/2451
12h
comment What is the meaning of “ Ψ is not a measurable quantity in itself”?
Concerning the complex nature of the wavefunction, see also physics.stackexchange.com/q/8062/2451 and links therein.
1d
comment What are the relative limitations of the Schrödinger, Pauli, and Dirac Equations?
Related: physics.stackexchange.com/q/10837/2451 and links therein.
1d
comment How to obtain Dirac equation from Schrodinger equation and special relativity?
Related: physics.stackexchange.com/q/10837/2451 and links therein.
1d
comment Spin in Schrodingers Equations
Possible duplicates: physics.stackexchange.com/q/10837/2451 and links therein.
1d
comment Why is energy in a system typically able to be described using quadratic expressions?
Related: physics.stackexchange.com/q/159021/2451 , physics.stackexchange.com/q/78500/2451 , physics.stackexchange.com/q/177505/2451 and links therein.
1d
comment Sum total distance of electrons on a spherical surface
Related: physics.stackexchange.com/q/39343/2451
1d
comment Where should five charges be placed inside a hollow sphere so as the system has the lowest potential energy?
Hi Enne. Welcome to Phys.SE post. Please don't repost a closed question in a new entry. Instead, you are supposed to edit the original question within the original entry.
1d
comment Where should five charges be placed inside a hollow sphere so as the system has the lowest potential energy?
Possible duplicate by OP: physics.stackexchange.com/q/178328/2451 Related: physics.stackexchange.com/q/39343/2451
1d
comment Derivation of plane wave from inner product of position ket and momentum ket
Related: physics.stackexchange.com/q/41880/2451 and links therein.
1d
comment About shift operators
Related: physics.stackexchange.com/q/177123/2451 and links therein.
1d
comment In Solution of the equation $\Box A_\sigma=0$. I find some mathematical difficulties
Related question by OP: physics.stackexchange.com/q/177313/2451
2d
comment Infinite series of derivatives of position when starting from rest
The important point is that the derivatives are still smooth.
2d
comment Infinite series of derivatives of position when starting from rest
Here is a plot of the $C^{\infty}$-function in the example.
Apr
23
comment Why haven't we seen the big bang?
Related: physics.stackexchange.com/q/26549/2451 , physics.stackexchange.com/q/12049/2451 and links therein.
Apr
23
comment Resolution to a hotly debated question: Which is more dangerous to humans, amps or volts?
Possible duplicates: physics.stackexchange.com/q/36440/2451 , physics.stackexchange.com/q/147922/2451 and links therein.
Apr
23
comment WKB boundary conditions
Possible duplicates: physics.stackexchange.com/q/168448/2451 and links therein.
Apr
23
comment Why do inverse square forces not rise asymptotically for $r\to 0$?
Possible duplicates: physics.stackexchange.com/q/68519/2451 , physics.stackexchange.com/q/176339/2451 and links therein.