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arXiv 1702.08446math.NAcond-mat.stat-mechcs.NAstat.CO
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曼陀罗在流形上:采样密度与积分函数

Monte Carlo on manifolds: sampling densities and integrating functions

Courant Institute of Mathematical Sciences, New York University(纽约大学柯朗数学科学研究所)

Emilio Zappa, Miranda Holmes-Cerfon, Jonathan Goodman

AI总结:

本文提出在欧几里得空间中定义的流形上基于马尔可夫链蒙特卡洛的方法,用于采样概率分布和计算积分,并通过实验验证了其在硬球系统熵计算中的有效性。

摘要:

我们描述并分析了在欧几里得空间中由等式和不等式约束定义的流形上的某些蒙特卡洛方法。首先,我们为在这些流形上定义的概率分布提供了一个MCMC采样器,该采样器使用特定的正交投影到表面,仅需关于流形切空间的信息,可通过约束函数的一阶导数获得,从而避免了曲率信息或二阶导数的需要。其次,我们利用该采样器开发了一种多阶段算法来计算这些流形上的积分。我们提供了单次运行误差估计,避免了需要多个独立运行。在各种测试问题上的计算实验显示,算法和误差估计在实践中有效。该方法应用于计算不同粘性硬球系统的熵,这些预测了硬粘性球在何种温度或相互作用能下环状结构比链状结构更优。

英文摘要:

We describe and analyze some Monte Carlo methods for manifolds in Euclidean space defined by equality and inequality constraints. First, we give an MCMC sampler for probability distributions defined by un-normalized densities on such manifolds. The sampler uses a specific orthogonal projection to the surface that requires only information about the tangent space to the manifold, obtainable from first derivatives of the constraint functions, hence avoiding the need for curvature information or second derivatives. Second, we use the sampler to develop a multi-stage algorithm to compute integrals over such manifolds. We provide single-run error estimates that avoid the need for multiple independent runs. Computational experiments on various test problems show that the algorithms and error estimates work in practice. The method is applied to compute the entropies of different sticky hard sphere systems. These predict the temperature or interaction energy at which loops of hard sticky spheres become preferable to chains.

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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