English, Article edition: THE STEADY STATE OF THE TAPPED ISING MODEL DAVID S. DEAN; ALEXANDRE LEFEVRE

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Bookmark: http://trove.nla.gov.au/version/143539
Physical Description
  • article
Language
  • English

Edition details

Title
  • THE STEADY STATE OF THE TAPPED ISING MODEL
Author
  • DAVID S. DEAN
  • ALEXANDRE LEFEVRE
Physical Description
  • article
Notes
  • We consider a tapping dynamics, analogous to that in experiments on granular media, on the simple one-dimensional ferromagnetic Ising model. When unperturbed, the system undergoes a single spin flip falling dynamics where only energy lowering moves occur. With this dynamics the system has an exponentially large number of metastable states and gets stuck in blocked or jammed configurations as do granular media. When stuck, the system is tapped, in order to make it evolve, by flipping in parallel each spin with probability p (corresponding to the strength of the tapping). Under this dynamics the system reaches a steady state regime characterized by an asymptotic energy per spin E(p), which is determined analytically. Within the steady state regime we compare certain time averaged quantities with the ensemble average of Edwards based on a canonical measure over metastable states of fixed average energy. The ensemble average yields results in excellent agreement with the dynamical measurements.
  • Dense granular media, Ising model, tapping, thermodynamics
  • RePEc:wsi:acsxxx:v:04:y:2001:i:04:p:333-343
Language
  • English
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