Publication : t08/030
Lower bound on the four-point dynamical susceptibility: Direct experimental test on a granular packing
Lechenault F. (CEA, IRAMIS, SPEC (Service de Physique de lEtat Condensé), F-91191 Gif-sur-Yvette, FRANCE)Dauchot O. (CEA, IRAMIS, SPEC (Service de Physique de lEtat Condensé), F-91191 Gif-sur-Yvette, FRANCE)
Biroli G. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
Bouchaud J.-P. (Science & Finance, Capital Fund Management 6 Bld Haussmann, F-75009 Paris, France)
Abstract:Année de publication : 2008
We track the motion of a horizontally vibrated amorphous assembly of bidisperse hard disks, for densities ranging across the jamming transition. We derive on very general grounds a bound on the dynamical susceptibility in terms of the response of the dynamics to a change in density. This generalizes a similar bound recently derived for equilibrium liquids. We find that in our experimental system the bound is tight and reproduces the non-monotonic behavior of the dynamical susceptibility both in time and density across the jamming transition. The underlying scaling behavior reveals an intimate connection between anomalous diffusion and dynamical heterogeneity.
Revue : Europhys. Lett. 83 46002 (2008)
DOI : 10.1209/0295-5075/83/46002
Preprint : arXiv:0712.2036v1
Lien : http://www.iop.org/EJ/abstract/-search=58657936.2/0295-5075/83/4/46002
Langue : Anglais
Fichier(s) à télécharger :
0295-5075_83_4_46002.pdf publi.pdf
