The composite operator (CJT) formalism in the (lambda phi(4)+eta phi(6))(D=3) model at finite temperature

Authors
Ananos, GNJ Svaiter, NF
Citation
Gnj. Ananos et Nf. Svaiter, The composite operator (CJT) formalism in the (lambda phi(4)+eta phi(6))(D=3) model at finite temperature, MOD PHY L A, 15(37), 2000, pp. 2235-2244
Citations number
13
Categorie Soggetti
Physics
Journal title
MODERN PHYSICS LETTERS A
ISSN journal
02177323 → ACNP
Volume
15
Issue
37
Year of publication
2000
Pages
2235 - 2244
Database
ISI
SICI code
0217-7323(200012)15:37<2235:TCO(FI>2.0.ZU;2-6
Abstract
We discuss the three-dimensional lambda phi (4) + eta phi (6) theory in the context of the 1/N expansion at finite temperature. We use the method of t he composite operator (CJT) for summing a large set of Feynman graphs. We a nalyze the behavior of the thermal square mass and the thermal coupling con stant in the low and high temperature limits. The existence of the tricriti cal point at some temperature is found using this method.