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Kovacs-like memory effect in driven granular gases.

A Prados1, E Trizac2

  • 1Física Teórica, Universidad de Sevilla, Apartado de Correos 1065, E-41080 Sevilla, Spain and Université Paris-Sud, Laboratoire de Physique Théorique et Modèles Statistiques, UMR CNRS 8626, 91405 Orsay, France.

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Summary
This summary is machine-generated.

Memory effects are intrinsic to dilute granular gases, not just dense systems. The granular temperature shows a nonmonotonic evolution, exhibiting normal or anomalous behavior based on dissipation strength.

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Area of Science:

  • Physics
  • Complex Systems
  • Statistical Mechanics

Background:

  • Memory effects are well-documented in dense disordered systems like glasses.
  • The dynamics of dilute granular gases are typically studied without considering memory phenomena.

Purpose of the Study:

  • To investigate the presence and nature of memory effects in dilute granular gases.
  • To analyze the behavior of granular temperature evolution under specific driving protocols.

Main Methods:

  • Combination of analytical techniques.
  • Computational simulations of granular gas dynamics.

Main Results:

  • Demonstrated that memory effects are intrinsic to dilute granular gases.
  • Observed a nonmonotonic evolution of granular temperature (T), forming a 'Kovacs hump'.
  • Found that the Kovacs hump exhibits normal behavior under weak dissipation and anomalous behavior under strong dissipation.

Conclusions:

  • Memory effects are a fundamental aspect of granular gas dynamics, even in dilute regimes.
  • Dissipation strength critically influences the manifestation of memory effects, leading to distinct normal and anomalous behaviors.