Journal
PHYSICS LETTERS B
Volume 563, Issue 3-4, Pages 173-178Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0370-2693(03)00699-3
Keywords
finite temperature; heat kernel expansion; effective action; Gauge invariance
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The lower order terms of the heat kernel expansion at coincident points are computed in the context of finite temperature quantum field theory for flat spacetime and in the presence of general gauge and scalar fields which may be non-Abelian and non-stationary. The computation is carried out in the imaginary time formalism and the result is fully consistent with invariance under topologically large and small gauge transformations. The Polyakov loop is shown to play a fundamental role. (C) 2003 Elsevier Science B.V. All rights reserved.
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