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cond-mat2000
A nonlinear differential approach to the Saffman-Taylor finger
G. Kälbermann, R. Wallach
Nonlinear time-dependent differential equations for the Hele-Shaw, Saffman-Taylor problem are derived. The equations are obtained using a separable ansatz expansion for the stream…
quant-ph2000
Diffraction of wave packets in space and time in three dimensions
G. Kälbermann
A simple formula for the scattering of wave packets from a square well at long times is derived. The expression shows that the phenomenon of wave packet diffraction in space and ti…