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arXiv 1005.0865cond-mat.stat-mechphysics.comp-phq-bio.PE
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循环种群动力学的熵产生

Entropy production of cyclic population dynamics

Benjamin Andrae, Jonas Cremer, Tobias Reichenbach, Erwin Frey

摘要:

熵是平衡态热力学中的中心观测量。然而,许多生物和生态系统的运行远离热平衡。在这里,我们表明,熵产生可以描述这种非平衡系统的行为。为此,我们计算的熵产生的人口模型,显示非平衡态行为导致的循环竞争。在一个临界点的动态表现出从大的,极限环的振荡小,不稳定的振荡。我们发现熵产生的峰值非常接近临界点,并趋于零时偏离它。我们进一步提供了计算熵产生的分析方法,与数值模拟非常吻合。

英文摘要:

Entropy serves as a central observable in equilibrium thermodynamics. However, many biological and ecological systems operate far from thermal equilibrium. Here we show that entropy production can characterize the behavior of such nonequilibrium systems. To this end we calculate the entropy production for a population model that displays nonequilibrium behavior resulting from cyclic competition. At a critical point the dynamics exhibits a transition from large, limit-cycle like oscillations to small, erratic oscillations. We show that the entropy production peaks very close to the critical point and tends to zero upon deviating from it. We further provide analytical methods for computing the entropy production which agree excellently with numerical simulations.

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