用谱行列式表示的波函数、格林函数和期望值
Wavefunctions, Green's functions and expectation values in terms of spectral determinants
摘要：
我们导出了经典混沌量子系统的波函数、格林函数和期望值的半经典近似。我们的方法包括应用奇异和正则微扰量子哈密顿。未微扰哈密顿量的波函数、格林函数和期望值用微扰哈密顿量的谱行列式表示。谱行列式的半经典remation方法的应用和产量近似的一个有限数量的经典轨迹。最后的公式有一个简单的形式。与Poincare截面曲面法不同，该方法是根据轨迹的周期来重新计算的。
英文摘要：
We derive semiclassical approximations for wavefunctions, Green's functions and expectation values for classically chaotic quantum systems. Our method consists of applying singular and regular perturbations to quantum Hamiltonians. The wavefunctions, Green's functions and expectation values of the unperturbed Hamiltonian are expressed in terms of the spectral determinant of the perturbed Hamiltonian. Semiclassical resummation methods for spectral determinants are applied and yield approximations in terms of a finite number of classical trajectories. The final formulas have a simple form. In contrast to Poincare surface of section methods, the resummation is done in terms of the periods of the trajectories.
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