标题： 变分微扰展开的收敛行为 显示英文标题

标题： Convergence Behavior of Variational Perturbation Expansions

摘要： 变分弱耦合微扰理论产生一致的收敛近似，无论耦合强度如何。 这使我们能够直接计算“强耦合”展开的系数。 对于非谐振子，我们解释了经验上观察到的收敛行为的物理起源，这种收敛行为以叠加振荡的指数速度迅速收敛。 显示英文摘要

摘要： Variational weak-coupling perturbation theory yields converging approximations, uniformly in the coupling strength. This allows us to calculate directly the coefficients of `strong-coupling' expansions. For the anharmonic oscillator we explain the physical origin of the empirically observed convergence behavior which is exponentially fast with superimposed oscillations.