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arXiv 0706.0450cond-mat.stat-mech
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具有波动资源的种群动力学的普适性质

Universal properties of population dynamics with fluctuating resources

Sayak Mukherjee, H. K. Janssen, B. Schmittmann

摘要:

从著名的定向渗流场论出发,我们描述了一个不断发展的人口,濒临灭绝,在一个环境中与自己的非平凡的时空动态。在这里,我们考虑的特殊情况下,环境遵循一个简单的松弛(模型A)的动态。出现了两个新的算子,其上临界维数为4,它们以非平凡的方式耦合了两个理论。虽然威尔逊-费舍尔固定点保持完全不受影响,但时间尺度的不匹配使通常的DP固定点不稳定,这表明从活跃(存活)到非活跃(灭绝)状态的一阶过渡的交叉。

英文摘要:

Starting from the well-known field theory for directed percolation, we describe an evolving population, near extinction, in an environment with its own nontrivial spatio-temporal dynamics. Here, we consider the special case where the environment follows a simple relaxational (Model A) dynamics. Two new operators emerge, with upper critical dimension of four, which couple the two theories in a nontrivial way. While the Wilson-Fisher fixed point remains completely unaffected, a mismatch of time scales destabilizes the usual DP fixed point, suggesting a crossover to a first order transition from the active (surviving) to the inactive (extinct) state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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