Comment on "Probing the equilibrium dynamics of colloidal hard spheres above the mode-coupling glass transition"

Details Comment on "Probing the equilibrium dynamics of colloidal hard spheres above the mode-coupling glass transition" Comment on "Probing the equilibrium dynamics of colloidal hard spheres above the mode-coupling glass transition"

2010-10-14

arxiv.org/abs/1010.2891v1

Physics

Condensed Matter

Soft Condensed Matter

Comment in print in Phys. Rev. Lett.; for accompanying reply see arXiv Brambilla et al. (Monday 18.10.2010)

Scientific paper

In the Letter [PRL 102, 085703 (2009)] Brambilla, et al. claimed to observe activated dynamics in colloidal hard spheres above the critical packing fraction of mode coupling theory (MCT). By performing microscopic MCT calculations, we show that polydispersity in their system shifts the critical packing fraction above the value determined by van Megen et al. for less polydisperse samples, and that the data agree with theory except for, possibly, the highest packing fraction.

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