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Vertex functions and infrared fixed point in Landau gauge SU(N) Yang-Mills theory | | Reinhard Alkofer
; Christian S. Fischer
; Felipe J. Llanes-Estrada
; | | Date: |
30 Dec 2004 | | Journal: | Phys.Lett. B611 (2005) 279-288 | | Subject: | hep-th hep-ph nucl-th | | Abstract: | The infrared behaviour of vertex functions in an SU(N) Yang-Mills theory in Landau gauge is investigated employing a skeleton expansion of the Dyson-Schwinger equations. The three- and four-gluon vertices become singular if and only if all external momenta vanish while the dressing of the ghost-gluon vertex remains finite in this limit. The running coupling as extracted from either of these vertex functions possesses an infrared fixed point. In general, diagrams including ghost-loops dominate in the infrared over purely gluonic ones. | | Source: | arXiv, hep-th/0412330 | | Services: | Forum | Review | PDF | Favorites | |
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