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      https://www.ias.ac.in/article/fulltext/pram/064/03/0423-0431

    • Keywords

       

      Solitary waves; FPU chain; equipartition; quasi-equilibrium

    • Abstract

       

      We show that time evolution initiated via kinetic energy perturbations in conservative, discrete, spring-mass chains with purely nonlinear, non-integrable, algebraic potentials of the formV(xi− xi+1) ∼ (xi− xi+1)2n,n ≥ 2 and an integer, occurs via discrete solitary waves (DSWs) and discrete antisolitary waves (DASWs). Presence of reflecting and periodic boundaries in the system leads to collisions between the DSWs and DASWs. Such collisions lead to the breakage and subsequent reformation of (different) DSWs and DASWs. Our calculations show that the system eventually reaches a stable ‘quasi-equilibrium’ phase that appears to be independent of initial conditions, possesses Gaussian velocity distribution, and has a higher mean kinetic energy and larger range of kinetic energy fluctuations as compared to the pure harmonic system withn = 1; the latter indicates possible violation of equipartition.

    • Author Affiliations

       

      T R Krishna Mohan1 Surajit Sen2

      1. CSIR Centre for Mathematical Modelling and Computer Simulation (C-MMACS), Bangalore - 560 037, India
      2. Department of Physics, State University of New York, Buffalo, New York - 14260-1500, USA
    • Dates

       
  • Pramana – Journal of Physics | News

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