4 papers
A Variational Perturbation Approach to One-Point Functions in QFT
Wen-Fa Lu
In this paper, we develop a variational perturbation (VP) scheme for calculating vacuum expectation values (VEVs) of local fields in quantum field theories. For a comparatively gen…
A Variational Perturbation Approximation Method in Tsallis Non-Extensive Statistical Physics
Wen-Fa Lu
For the generalized statistical mechanics based on the Tsallis entropy, a variational perturbation approximation method with the principle of minimal sensitivity is developed by ca…
Phase Diagram of a Two-Dimensional Neutral Classical Coulomb Gas from a Non-perturbative sine-Gordon Expansion
Wen-Fa Lu, Chul Koo Kim
Within the sine-Gordon formalism of a two-dimensional neutral classical Coulomb gas, a convergent expansion with non-perturbative nature is performed to calculate the thermodynamic…
A General Type of a Coherent States with Thermal Effects
Wen-Fa Lu
Within the framework of thermofield dynamics, we construct a thermalized coherent thermal state, which is a general type of the coherent state with the thermal effects and can be p…