The notion of a strategy in the multi-player version of the Parrondo game is reviewed. We calculate the gain for the greedy strategy as a function of the number N of players, including exact analytic results for N < 4 and in the limit N→∞. We show that the greedy strategy is optimal for N = 1 and N = 2 but not for N = 3. In the limit N→∞ our analysis reveals a very rich behavior including the possibility of phase transitions as a function of the chosen strategy.
A hard disk microscopic ratchet is introduced and studied with molecular dynamics. The properties of the systematic motion that appears when its two compartments are at different temperatures is documented.
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