Gauge-invariant correlation functions
- 15 May 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 39 (10) , 3197-3199
- https://doi.org/10.1103/physrevd.39.3197
Abstract
A formalism is discussed that gives correlation functions, the poles of which define the physical excitation spectrum in gauge theories. Fermionic excitations in QED are used as an example. The fermion spectrum in a high-temperature plasma is studied as an illustrative application of the formalism. The connection to kinetic theory is made.Keywords
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