Andersen Thermostat

• Wall thermostat without the wall

• Each molecule undergoes impulsive “collisions” with a heat bath at random intervals

• Collision frequency n describes strength of coupling

  • Probability of collision over time dt is n dt
  • Poisson process governs collisions

• Simulation becomes a Markov process

  • PNVE is a “deterministic” TPM
    it is not ergodic for NVT, but P is
    

• Click here to see the Andersen thermostat in action

random p

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