Applicability of the linear δ expansion for the λ 4 field theory at finite temperature in the symmetric and broken phases

Nenhuma Miniatura disponível

Data

2008-09-29

Orientador

Coorientador

Pós-graduação

Curso de graduação

Título da Revista

ISSN da Revista

Título de Volume

Editor

Tipo

Artigo

Direito de acesso

Resumo

The thermodynamics of a scalar field with a quartic interaction is studied within the linear δ expansion (LDE) method. Using the imaginary-time formalism the free energy is evaluated up to second order in the LDE. The method generates nonperturbative results that are then used to obtain thermodynamic quantities like the pressure. The phase transition pattern of the model is fully studied, from the broken to the symmetry restored phase. The results are compared with those obtained with other nonperturbative methods and also with ordinary perturbation theory. The results coming from the two main optimization procedures used in conjunction with the LDE method, the principle of minimal sensitivity (PMS) and the fastest apparent convergence (FAC) are also compared with each other and studied in which cases they are applicable or not. The optimization procedures are applied directly to the free energy. © 2008 The American Physical Society.

Descrição

Palavras-chave

Idioma

Inglês

Como citar

Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 78, n. 6, 2008.

Itens relacionados

Financiadores