On frequency-dependent and time-dependent diffusivities

V. Halpern

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The time-dependent diffusivity D(t) is usually defined as the coefficient that appears in the diffusion equation, while the frequency-dependent diffusivity D( omega ) is defined the Fourier transform of the velocity-velocity correlation function. D( omega )/(i omega ), rather than D( omega ), is the Fourier transform of D(t).

Original languageEnglish
Article number006
Pages (from-to)184-185
Number of pages2
JournalEuropean Journal of Physics
Issue number4
StatePublished - 1992


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