arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.10849q-bio.PEcond-mat.dis-nn
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Fisher几何模型中适应度极大值个数的分布

Distribution of the number of fitness maxima in Fisher's Geometric Model

Su-Chan Park, Sungmin Hwang, Joachim Krug

摘要:

Fisher几何模型通过将从基因型的离散空间到$n$维欧几里得表型空间的线性映射与非线性单峰表型适应度映射相结合来描述生物适应度景观。基因型由长度为$L$的二进制序列表示,不同位点突变的表型效应由从各向同性高斯分布中提取的$L$随机向量表示。最近的工作表明,基因型和表型水平之间的相互作用产生了一系列不同的景观地形,其特点是当地的健身最大值的数量。扩展我们以前的研究的平均数的局部最大值,在这里,我们专注于分布的最大值的数量时,限制$L \to \infty$采取有限的$n$。我们确定了一般$n$极大值个数的典型尺度,并确定了一维情形极大值的全尺度概率密度和两点相关函数。我们还详细说明了该模型的反铁磁Hopfield模型与$n$随机连续模式向量的密切关系,并表明我们的许多结果结转到这个设置。更一般地说,我们希望我们的分析可以帮助阐明在各种自旋玻璃问题的亚稳态的波动结构。

英文摘要:

Fisher's geometric model describes biological fitness landscapes by combining a linear map from the discrete space of genotypes to an $n$-dimensional Euclidean phenotype space with a nonlinear, single-peaked phenotype-fitness map. Genotypes are represented by binary sequences of length $L$, and the phenotypic effects of mutations at different sites are represented by $L$ random vectors drawn from an isotropic Gaussian distribution. Recent work has shown that the interplay between the genotypic and phenotypic levels gives rise to a range of different landscape topographies that can be characterised by the number of local fitness maxima. Extending our previous study of the mean number of local maxima, here we focus on the distribution of the number of maxima when the limit $L \to \infty$ is taken at finite $n$. We identify the typical scale of the number of maxima for general $n$, and determine the full scaled probability density and two point correlation function of maxima for the one-dimensional case. We also elaborate on the close relation of the model to the anti-ferromagnetic Hopfield model with $n$ random continuous pattern vectors, and show that many of our results carry over to this setting. More generally, we expect that our analysis can help to elucidate the fluctuation structure of metastable states in various spin glass problems.

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