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Please use this identifier to cite or link to this item: http://hdl.handle.net/1993/3856

Title: Cutting rules for Feynman diagrams at finite temperature.
Authors: Chowdhury, Usman
Supervisor: Kobes, Randy (Physics and Astronomy) Carrington, Margaret E. (Physics and Astronomy)
Examining Committee: Southern, Byron W. (Physics and Astronomy) Schippers, Eric (Mathematics)
Graduation Date: February 2010
Keywords: Quantum Field Theory
Finite Temperature
Retarded/Advanced-basis
Keldysh-basis
Primary-basis
cutting-rules
circling
vertex
vertices
isolated
island
self-energy
Imaginary
retarded
Issue Date: 13-Jan-2010
Abstract: The imaginary part of the retarded self energy is of particular interest as it contains a lot of physical information about particle interactions. In higher order loop diagrams the calculation become extremely tedious and if we have to do the same at finite temperature, it includes an extra dimension to the difficulty. In such a condition we require to switch between bases and select the best basis for a particular diagram. We have shown in our calculation that in higher order loop diagrams, at finite temperature, the R/A basis is most convenient on summing over the internal vertices and very efficient on calculating some particular diagrams while the result is most easily interpretable in the Keldysh basis for most other complex diagrams.
URI: http://hdl.handle.net/1993/3856
Appears in Collection(s):FGS - Electronic Theses & Dissertations (Public)

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