Year: 2000
Type: article
Abstract: We study the optimized perturbation theory (OPT) at finite temperature, which is a self-consistent resummation method. Firstly, we generalize the idea of the OPT to optimize the coupling constant in λφ4 theory, and give a proof of the renormalizability of this generalized OPT. Secondly, the principle of minimal sensitivity and the criterion of the fastest apparent convergence, which are conditions to determine the optimal parameter values, are examined in λφ4 theory. Both conditions exhibit a second-order transition at finite temperature with critical exponent β=0.5 in the two-loop approximation.
Source: Progress of Theoretical Physics
DOI: 10.1143/ptp.104.1129
Author: S. Chiku
Institutions: University of Tsukuba, Kyoto University
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2088272144