2014-06-112014-06-112011ELIAS, Walace de Sousa. Quebra dinâmica da simetria quiral na pseudo eletrodinâmica quântica em (2 + 1) dimensões. 2011. 68 f. Dissertação (Mestrado) - Universidade Federal do Pará, Instituto de Ciências Exatas e Naturais, Belém, 2011. Programa de Pós-Graduação em Física.https://repositorio.ufpa.br/handle/2011/5049In the present work, we study the chiral symmetry breaking in pseudo quantum electrodynamics in (2+1) dimensions using the Schwinger-Dyson equation formalism and investigate the similarities of this model with the criticality in both QED3 and QED4. Using the rainbow-quenched approximation we show that there is a critical coupling αcc = π/16 above which there is a mass generation for fermions and hence the chiral symmetry breaking occurs. We also study the N massless fermions flavors version using the 1/N expansion in rainbow-unquenched approximation and we obtain a critical value for the number of active fermions below which there is chiral symmetry breaking. We show that at strong gauge coupling constant (g -- ∞) this critical number is the same as in QED3 in large N expansion.porAcesso AbertoTeoria quântica de camposEletrodinâmica quânticaDissertaçãoCNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DAS PARTICULAS ELEMENTARES E CAMPOS