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Effective Temperatures and Activated Dynamics for a Two-Dimensional Air-Driven Granular System on Two Approaches to Jamming
Department of Physics Papers
  • Adam Ross Abate, University of Pennsylvania
  • Douglas J. Durian, University of Pennsylvania
Document Type
Journal Article
Date of this Version
12-10-2008
Abstract

We present experiments on several distinct effective temperatures in a granular system at a sequence of increasing packing densities and at a sequence of decreasing driving rates. This includes single-grain measurements based on the mechanical energies of both the grains and an embedded oscillator, as well as a collective measurement based on the Einstein relation between diffusivity and mobility, which all probe different time scales. Remarkably, all effective temperatures agree. Furthermore, mobility data along the two trajectories collapse when plotted vs effective temperature and exhibit an Arrhenius form with the same energy barrier as the microscopic relaxation time.

Comments
Suggested Citation:
A.R. Abate and D.J. Durian. (2008). "Effective Temperatures and Activated Dynamics for a Two-Dimensional Air-Driven Granular System on Two Approaches to Jamming." Physical Review Letters. 101, 245701.

© 2008 The American Physical Society
http://dx.doi.org/10.1103/PhysRevLett.101.245701
Citation Information
Adam Ross Abate and Douglas J. Durian. "Effective Temperatures and Activated Dynamics for a Two-Dimensional Air-Driven Granular System on Two Approaches to Jamming" (2008)
Available at: http://works.bepress.com/douglas_durian/15/