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El background field method y la técnica pinch
Keywords:
Teoría cuántica de campos, análisis comparativo, teoría de perturbaciones (es)Downloads
El Background Field Method (BFM) y la Técnica Pinch (PT) son dos métodos que mantienen la invarianza de gauge cuando se cuantiza una teoría de campos. El BFM es una teoría cuántica de campos y es válido para todos los órdenes en teoría de perturbaciones. El BFM puede ser aplicable a todas las funciones de Green. La PT no es una teoría de campos cuánticos y tiene que ser construida de tal forma que ésta sea invariante de gauge. El propósito de este artículo es comparar los dos métodos y mostrar algunas aplicaciones.
Background Field Method (BFM) and Pinch Technique (PT) are two methods to maintain explicity gauge invariance when quantization is done in a field theory. BFM is a quantum field theory and it works at all levels in perturbation theory. BFM can be applied to every interaction vertex and Green function too. The PT has the same goal BFM but it is not a quantum field theory so it has to construct the variables and functions in the way they would be gauge invariant. The article's aim is to compare these methods and to show sorne applications from them.
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