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DrDu's latest activity
D
DrDu
replied to the thread
I
Do hyperbolic harmonics exist?
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https://projecteuclid.org/journals/communications-in-mathematical-physics/volume-8/issue-1/Matrix-elements-of-representations-of-non-comp...
Today, 7:46 AM
D
DrDu
replied to the thread
Unlocking the Secrets of Prof. Verschure's Rosetta Stones
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Usually, when talking about PPL, you assume that the polarizer is present, but the analyzer has been removed.
Monday, 2:16 AM
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DrDu
replied to the thread
I
Citation needed: Only multivariate rotationally invariant distribution with iid components is a multivariate normal distribution
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On a Characterization of the Normal Distribution M. Kac American Journal of Mathematics, Vol. 61, No. 3 (Jul., 1939), pp. 726-728 (3...
Monday, 12:31 AM
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DrDu
replied to the thread
Unlocking the Secrets of Prof. Verschure's Rosetta Stones
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The orientation of the polariser is best detected by the pleochroism of biotite. Biotite, cut perpendicular to the sheets, appears dark...
Friday, 1:02 AM
D
DrDu
replied to the thread
Unlocking the Secrets of Prof. Verschure's Rosetta Stones
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Yes, if it is quartz, it can only have formed diagenetically.
Friday, 12:51 AM
D
DrDu
replied to the thread
Unlocking the Secrets of Prof. Verschure's Rosetta Stones
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The white rim looks like quartz to me.
Thursday, 2:55 PM
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DrDu
posted the thread
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Citation needed: Only multivariate rotationally invariant distribution with iid components is a multivariate normal distribution
in
Set Theory, Logic, Probability, Statistics
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I need a citation for the following proposition: Assume a random vector ##X=(X_1, ..., X_n)^T## with iid components ##X_i## and mean 0...
Thursday, 2:21 AM
D
DrDu
replied to the thread
I
Hartree-Fock: Feynman diagrams vs perturbation theory
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Well, if ##H=H_0+\epsilon V## and ##R=(H-\lambda)^{-1}## and similarly ##R_0##, then the one particle Greensfunction is something like...
Apr 17, 2024
D
DrDu
replied to the thread
I
Hartree-Fock: Feynman diagrams vs perturbation theory
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Basically, Feynman diagrams are related to a perturbation expansion of the resolvent (H-lambda)^{-1} and not of the hamiltonian itself...
Apr 17, 2024
D
DrDu
replied to the thread
New Insight into the Chemistry of Solvents
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If you consider the electron gas as a solvent for the positive ionic cores in a metal, the Cooper mechanism in superconductors is just...
Apr 17, 2024
D
DrDu
replied to the thread
Separation of KCl from potassium chromium(III) PDTA
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There are syntheses which don't seem to have KCl as a byproduct, e.g. https://www.mdpi.com/2313-0105/9/12/573 or here...
Apr 16, 2024
D
DrDu
replied to the thread
Classical
Looking for a thermodynamics book that 'ties it all together'
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I would recommend Max Plancks book https://www.amazon.de/Treatise-Thermodynamics-Dover-Books-Physics/dp/048666371X He did his PhD on...
Apr 10, 2024
D
DrDu
replied to the thread
Unlocking the Secrets of Prof. Verschure's Rosetta Stones
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Very nice slide! You should also try to identify the pleochroism of the arfvedsonite. From your picture, one already recognizes a change...
Apr 5, 2024
D
DrDu
replied to the thread
A
QFT Superposition of Final States
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See for example: https://en.wikipedia.org/wiki/Infraparticle
Apr 4, 2024
D
DrDu
replied to the thread
A
QFT Superposition of Final States
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As far as I understand it, almost all different outcomes are in separate superselection sectors (differing by an infinite number of soft...
Apr 3, 2024
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