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On the Cholesky decomposition for electron propagator methods:General aspects and application on C_(60)

机译:电子传播方法的Cholesky分解:一般方面及其在C_(60)上的应用

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To treat the electronic structure of large molecules by electron propagator methods we developed aparallel computer program called P-RICDΣ. The program exploits the sparsity of the two-electronintegral matrix by using Cholesky decomposition techniques. The advantage of these techniques isthat the error introduced is controlled only by one parameter, which can be chosen as small asneeded. We verify the tolerance of electron propagator methods to the Cholesky decompositionthreshold and demonstrate the power of the P-RICDΣ program for a representative example (C_(60)).All decomposition schemes addressed in literature are investigated. Even with moderate thresholdsthe maximal error encountered in the calculated electron affinities and ionization potentials amountto a few meV only, and the error becomes negligible for small thresholds.
机译:为了通过电子传播器方法处理大分子的电子结构,我们开发了一个并行的计算机程序,称为P-RICDΣ。该程序通过使用Cholesky分解技术利用了两个电子积分矩阵的稀疏性。这些技术的优点在于,引入的误差仅由一个参数控制,可以根据需要选择一个很小的参数。我们验证了电子传播方法对Cholesky分解阈值的容忍度,并演示了P-RICDΣ程序的代表性示例(C_(60))的功能。研究了文献中涉及的所有分解方案。即使具有中等阈值,在计算出的电子亲和力和电离电势中遇到的最大误差也仅为几个meV,对于较小的阈值,该误差可以忽略不计。

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