Quebra dinâmica da simetria quiral na pseudo eletrodinâmica quântica em (2 + 1) dimensões
In 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...
| Autor principal: | ELIAS, Walace de Sousa |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Pará
2014
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.ufpa.br/jspui/handle/2011/5049 |
| Resumo: |
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In 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. |