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Asymptotic behaviors of the heat kernel in covariant perturbation theory. (English) Zbl 0809.53075

Summary: 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 behaviors of the trace of the heat kernel are presented with this accuracy. The late-time behavior 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.

MSC:

53Z05 Applications of differential geometry to physics
81Q15 Perturbation theories for operators and differential equations in quantum theory

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