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Specific heat in nonequilibrium systems.

T Tao1, A Yoshimori, T Odagaki

  • 1Department of Physics, Faculty of Science, Kyushu University, Fukuoka 812-8581, Japan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 3, 2001
PubMed
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We developed a new method to calculate specific heat in nonequilibrium systems. This framework reveals how observation time influences specific heat, connecting it to quenched and annealed states and glass transition dynamics.

Area of Science:

  • Thermodynamics
  • Statistical Mechanics
  • Physical Chemistry

Background:

  • Calculating specific heat in nonequilibrium systems is challenging.
  • System dynamics often involve fast intra-basin motion and slow inter-basin transitions.

Purpose of the Study:

  • To propose a general framework for calculating specific heat in nonequilibrium systems.
  • To investigate the dependence of specific heat on observation and waiting times.
  • To apply the framework to gaseous hydrogen.

Main Methods:

  • Developed a general framework separating fast and slow dynamics.
  • Analyzed the energy landscape with basins and stochastic jumps.
  • Calculated specific heat for gaseous hydrogen under varying observation times.

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Main Results:

  • The specific heat approaches quenched values at short observation times and annealed values at long observation times.
  • Shorter waiting times require longer observation times for equivalent annealing.
  • Findings align with the effect of quenching rate on glass transition temperature.

Conclusions:

  • The proposed framework provides a method to study nonequilibrium specific heat.
  • Observation and waiting times are critical factors influencing thermodynamic properties.
  • The study offers insights into the relationship between nonequilibrium dynamics and phase transitions.