Green's function expansion in a set of eigenfunction


by kristobal hunta
Tags: eigenfunction, expansion, function, green
kristobal hunta
kristobal hunta is offline
#1
Sep22-04, 09:18 PM
P: 7
Hi! I encountered the problem that I need to decompose the Green function into a set of eigenfunction. Particularly, I have the free space Green function
[tex] G(\vec r; \vec r') = \frac {e^{i k | \vec r - \vec r'|} } {4 \pi | \vec r - \vec r'|} [/tex]
and I need to express it into series of cylindrical mode eigenfunctions
[tex] \Psi ( \vec r; k) = H_m ( q r) sin( h z) e^{i m \phi} [/tex]
[tex] k^2 = q^2 + h^2, h = \frac { \pi } {2 L} [/tex]

here H - Hankel's function of the first kind.
Eigenfunction forms a complete set, with discrete spectrum of eigenvalues q and h.
I know that we can decompose the Green function into set of eigenfunctions, but I have the Green function for spherical representation, and eigenfunctions are from waveguide formed by two infinite plates parallel to each other. I couldn't find anything relevant about expanding the Green function into arbitrary set of eigenfunctions. Would appreciate any opinion or advice on the matter :)
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Dr Transport
Dr Transport is offline
#2
Sep23-04, 09:32 PM
Sci Advisor
PF Gold
P: 1,458
Look in Jackson's Electrodynamics book, I believe that the solution can be found by applying either chapter 2 or 3's methods.
waseem
waseem is offline
#3
Oct4-04, 02:36 AM
P: 1
i want notes about quantum dynamics(schrodinger,heisenberg and interaction representation or pictures of quantum mechanics)


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