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Sep
1
comment Laplacian of $1/r^2$ (context: electromagnetism and poisson equation)
Thanks. This is the sort of answer I usually expect when I ask a question at physics.stackexchange. Sometimes an intuitive and short argument can be very enlightening.
Aug
27
comment Is this Landau's other critical phenomena mistake?
Can we find Landau's argument in Landau & Lifshitz? If so, what volume and page? Thx.
Aug
19
comment Numerical computation of the Rayleigh-Lamb curves
+1 That's a good idea certainly worth exploring. I'll keep you posted.
Aug
19
comment Why isn't there a centre of charge?
Just as the center of mass is a location without a mass and so it does not by itself define a potential, the monopole moment of the charge (this is not the same as the monopole term in the power series of the potential) is a charge without a location and by itself it doesn't define a potential. What I'm saying is that the dipole moment of the charge, divided by the total charge, gives a location that is analogous to the location given by the center of mass.
Aug
19
comment Why isn't there a centre of charge?
I could be wrong, but I'd say that the analogue of center of mass is the dipole moment, not the monopole moment. The monopole moment is the analog of the total mass, but total mass is not the same as center of mass. Just compare the formulas for the center of mass and the dipole moment: they are the same, but with charges instead of masses.
Aug
19
accepted Relativistic space-time geometry
Aug
19
revised Numerical computation of the Rayleigh-Lamb curves
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Aug
18
comment Complete vs General Integral of first order PDE
Landau does refer to Hamilton-Jacobi equations. Can you point me to some other references where the same notions are used relating to Hamilton-Jacobi equations (in classical mechanics)? Perhaps seeing them will clarify me.
Aug
18
comment Numerical computation of the Rayleigh-Lamb curves
@Alice: The problem is there is more than one root. Blindly bracketing for roots can miss some of them.
Aug
18
comment Numerical computation of the Rayleigh-Lamb curves
@Timtam: Solving for the eigenvalues analytically is part of the problem
Aug
17
revised Complete vs General Integral of first order PDE
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Aug
17
revised Why is the Ritz combination principle incompatible with Classical Mechanics?
corrected title
Aug
16
revised Planck's Law in terms of wavelength
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Aug
16
answered Planck's Law in terms of wavelength
Aug
16
asked Complete vs General Integral of first order PDE
Aug
12
revised
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Aug
12
revised
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Aug
12
suggested approved edit on
Aug
12
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Aug
12
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