Asymptotic behaviours of the heat kernel in covariant perturbation theory

Abstract

The trace of the heat kernel is expanded in a basis of nonlocal curvature invariants of $N$th order. The coefficients of this expansion (the nonlocal form factors) are calculated to third order in the curvature inclusive. The early-time and late-time asymptotic behaviours of the trace of the heat kernel are presented with this accuracy. The late-time behaviour gives the criterion of analyticity of the effective action in quantum field theory. The latter point is exemplified by deriving the effective action in two dimensions.

22 pages, REVTeX, Alberta Thy 45-93

References in corpus (2)

• The basis of nonlocal curvature invariants in quantum gravity theory
• Covariant Perturbation Theory (IV). Third Order in the Curvature

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