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Density waves are characteristic for fluidized beds and affect measurementson liquid-like dynamics in fluidized granular media. Here, the intensityautocorrelation function as obtainable with diffusing-wave spectroscopy isderived in the presence of density waves. The predictions by the derived formof the IACF match experimental observations from a gas-fluidized bed. The modelsuggests separability of the contribution from density waves from thecontribution by microscopic scatterer displacement to the decay of correlation,thus paves the way for characterizing microscopic particle motions usingdiffusing-wave spectroscopy as well as heterogeneities in fluidized granularmedia.

Probing density waves in fluidized granular media with diffusing-wave spectroscopy