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Forward-Backward Semiclassical Dynamics with Linear Scaling

机译:具有线性比例的前后半经典动力学

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摘要

A forward-backward semiclassical method is presented for calculating correlation functions of polyatomic systems. Unlike conventional semiclassical theories, this formulation does not require evaluation of the prefactor that contains a determinant with elements defined by the stability matrix. It is shown rigorously that the contribution of the semiclassical prefactor in the present formulation can be absorbed in the semiclassical phase and initial density if the momentum jump at the end of the forward propagation is chosen to be one-half of that dictated by the classical equations of motion. As a consequence, the number of equations of motion to be solved in its implementation is linearly proportional to the number of degrees of freedom. The method is applied to the dynamics of water clusters which involve strongly anharmonic interactions.
机译:提出了一种用于计算多原子系统相关函数的前向后半经典方法。与传统的半经典理论不同,此公式不需要评估包含因数由稳定性矩阵定义的行列式的因子。严格显示,如果将向前传播结束时的动量跳变选择为经典方程式规定的一半,则可以将本类公式中半经典因子的贡献吸收到半经典相和初始密度中。运动。结果,在其实现中要解决的运动方程的数量与自由度的数量成线性比例。该方法适用于涉及强烈非谐相互作用的水团簇的动力学。

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