Fig. 1
Comparison of the fluidized granular medium in microgravity and on the ground at a low- filling fraction Φ of 0.48. The medium expands in microgravity and particles are distributed throughout the sample cell, which equilibrates filling fraction Φ and packing fraction ϕ. On the ground, the medium stays settled at a high-packing fraction ϕ (a). Larger voids move through the sample in both cases, thus local packing fraction fluctuations occur which lead to strong measured deviations from Γ-distributed intensity values in both cases (b). The obtained intensity autocorrelation functions (IACF) accordingly exhibit two distinct decays (c)
