Observing brownian motion in vibration-fluidized granular matter
dc.contributor.author | D'Anna, G. | en_US |
dc.contributor.author | Mayor, P. | en_US |
dc.contributor.author | Barrat, A. | en_US |
dc.contributor.author | Loreto, V. | en_US |
dc.contributor.author | Nori, Franco | en_US |
dc.date.accessioned | 2009-06-01T17:25:14Z | |
dc.date.available | 2009-06-01T17:25:14Z | |
dc.date.issued | 2003-08-21 | en_US |
dc.identifier.citation | D'Anna, G; Mayor, P; Barrat, A; Loreto, V; Nori, F. (2003) "Observing brownian motion in vibration-fluidized granular matter." Nature 424(6951): 909-912. <http://hdl.handle.net/2027.42/62585> | en_US |
dc.identifier.issn | 0028-0836 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/62585 | |
dc.identifier.uri | http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=retrieve&db=pubmed&list_uids=12931179&dopt=citation | en_US |
dc.description.abstract | Observation of the rotational brownian motion(1,2) of a very fine wire immersed in a gas led to one of the most important ideas of equilibrium statistical mechanics. Namely, the many-particle problem of a large number of molecules colliding with the wire can be represented by just two macroscopic parameters: viscosity and temperature. Interest has arisen in the question of whether this idea (mathematically developed in the Langevin model and the fluctuation-dissipation theorem(3,4)) can also be used to describe systems that are far from equilibrium. Here we report an experimental investigation of an archetypal non-equilibrium system, involving a sensitive torsion oscillator immersed in a granular system(5,6) of millimetre-size grains that are fluidized by strong external vibrations. The vibro-fluidized granular medium is a driven environment, with continuous injection and dissipation of energy, and the immersed oscillator can be seen as analogous to an elastically bound brownian particle. By measuring the noise and the susceptibility, we show that the experiment can be treated (to a first approximation) with the equilibrium formalism. This gives experimental access to a granular viscosity and an effective temperature; however, these quantities are anisotropic and inhomogeneous. Surprisingly, the vibrofluidized granular matter behaves as a 'thermal' bath satisfying a fluctuation-dissipation relation. | en_US |
dc.format.extent | 421842 bytes | |
dc.format.extent | 2489 bytes | |
dc.format.mimetype | application/octet-stream | |
dc.format.mimetype | text/plain | |
dc.publisher | Nature Publishing Group | en_US |
dc.source | Nature | en_US |
dc.title | Observing brownian motion in vibration-fluidized granular matter | en_US |
dc.type | Article | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Univ Michigan, Dept Phys, CSCS, Ctr Theoret Phys, Ann Arbor, MI 48109 USA | en_US |
dc.contributor.affiliationother | Ecole Polytech Fed Lausanne, Fac Sci Base, Inst Phys Mat Complexe, CH-1015 Lausanne, Switzerland | en_US |
dc.contributor.affiliationother | Univ Paris 11, UMR 8627, Phys Theor Lab, F-91405 Orsay, France | en_US |
dc.contributor.affiliationother | Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy | en_US |
dc.contributor.affiliationother | INFM, I-00185 Rome, Italy | en_US |
dc.contributor.affiliationother | RIKEN, Inst Phys & Chem Res, Frontier Res Syst, Wako, Saitama 3510198, Japan | en_US |
dc.identifier.pmid | 12931179 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/62585/1/nature01867.pdf | |
dc.identifier.doi | http://dx.doi.org/10.1038/nature01867 | en_US |
dc.identifier.source | Nature | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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