2000/07/17 by Sang Koo You, Chul Koo Kim, Chul-Kyu Kim +2
Chemistry · Mathematics · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Applied mathematics #Classical mechanics #Computer science #Mathematical analysis #Mathematical physics #Mathematics #Particle system #Perturbation (astronomy) #Perturbation theory (quantum mechanics) #Physics #Quantum Mechanics and Non-Hermitian Physics #Quantum and electron transport phenomena #Quantum mechanics #Variational method #Variational principle #Yukawa potential #cond-mat.str-el
paper · pdf · doi:10.1103/physrevc.62.045503
accepted for publication in Phys. Rev. C
arxiv created 2000/07/17 · openalex publication_date 2000/09/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A variational perturbation theory based on the functional integral approach is formulated for many-particle systems. Using the variational action obtained through Jensen-Peierls' inequality, a perturbative expansion scheme for the thermodynamic potential is established. A modified Wick's theorem is obtained for the variational perturbation expansions. This theorem allows one to carry out systematic calculations of higher order terms without worrying about the double counting problem. A model numerical calculation was carried out on a nucleon gas system interacting through the Yukawa-type potential to test the efficiency of the present method.