Energy and Eigenstate Using First Order Perturbation Theory

TL;DR

This paper presents a method to estimate the energy and eigenstates of a perturbed quantum system using first order perturbation theory, providing a straightforward computational approach.

Contribution

It introduces a simple first order perturbation technique for calculating energies and eigenstates based on basis summation.

Findings

Accurate first order energy estimates for perturbed systems

Eigenstates approximated using basis summation

Method simplifies perturbation calculations

Abstract

The first order estimate of energy and eigenstate of a perturbed system are found by summation over its basis.