Non-Commutative Rayleigh—Schrodinger Perturbation Theory and Its Applications in Quantum Chemistry

Perturbation theory in the path-integral

Perturbation theory in the path-integral representation and its application to some simple quantum systems

✍ Y. U. E. Perlin; S. H. N. Gifeisman; Pham Van Quyet 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 561 KB

## Abstract In the framework of the path‐integral formalism of nonrelativistic quantum theory the perturbation method is developed. This is based on the cumulative expansion of the partition function in powers of the difference between the classical actions of the exact and trial system. The trial