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Anomalia de escala e invariância de calibre em eletrodinâmica quântica: um estudo diagramático
(Universidade Federal de Minas GeraisUFMG, 2012-08-24)
Symmetry under dilatation appears at classical level should a Lagrangian be free of dimensionful constants. The Noether current associated to this symmetry is called dilatation current. Quantum symmetry breaking of dilation ...
Invariância de rótulo, termos de superfície e simetria de calibre em diagramas de Feynman a um laço em eletrodinâmica quântica
(Universidade Federal de Minas GeraisUFMG, 2011-06-03)
The purpose of the present work is to shed light on the relationship between momentum routing invariance surface terms and gauge invariance using quantum electrodynamics as a working example. We discuss two approaches. On ...