title: Contact nonlinearities and linear response in jammed particulate packings.
abstract: Packings of frictionless athermal particles that interact only when they overlap experience a jamming transition as a function of packing density. Such packings provide the foundation for the theory of jamming. This theory rests on the observation that, despite the multitude of disordered configurations, the mechanical response to linear order depends only on the distance to the transition. We investigate the validity and utility of such measurements that invoke the harmonic approximation and show that, despite particles coming in and out of contact, there is a well-defined linear regime in the thermodynamic limit.
authors.affiliation: Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Carl P
authors.initials: CP
authors.lastname: Goodrich
authors.affiliation: Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Andrea J
authors.initials: AJ
authors.lastname: Liu
authors.affiliation: James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: Sidney R
authors.initials: SR
authors.lastname: Nagel
mesh_terms: D016014:Linear Models; D055595:Mechanical Phenomena; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D013816:Thermodynamics; D013997:Time Factors; D014732:Vibration