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arXiv 1305.1995nucl-th
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用变分Monte Carlo方法计算核壳模型的Lanczos方法的随机推广

Stochastic extension of the Lanczos method for nuclear shell-model calculations with variational Monte Carlo method

Noritaka Shimizu, Takahiro Mizusaki, Kazunari Kaneko

摘要:

本文提出了一种基于Krylov子空间的变分蒙特卡罗(VMC)方法用于大规模壳模型计算。VMC中的一个随机游走器是用$M$格式表示的,它从一个完整的希尔伯特空间随机空间中抽取少量的配置。这VMC框架中证明了壳模型计算的$^{48}$铬和$^{60}$锌,我们讨论了它的关系到一个小数目的Lanczos迭代。利用传统的粒子-空穴-激发截断得到的波函数作为初始状态,这种VMC方法为我们提供了一系列系统改进的结果。

英文摘要:

We propose a new variational Monte Carlo (VMC) approach based on the Krylov subspace for large-scale shell-model calculations. A random walker in the VMC is formulated with the $M$-scheme representation, and samples a small number of configurations from a whole Hilbert space stochastically. This VMC framework is demonstrated in the shell-model calculations of $^{48}$Cr and $^{60}$Zn, and we discuss its relation to a small number of Lanczos iterations. By utilizing the wave function obtained by the conventional particle-hole-excitation truncation as an initial state, this VMC approach provides us with a sequence of systematically improved results.

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