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Covariant perturbation expansion of off-diagonal heat kernel (1603.00446v1)
Published 28 Feb 2016 in cond-mat.stat-mech, hep-th, math-ph, math.MP, and quant-ph
Abstract: Covariant perturbation expansion is an important method in quantum field theory. In this paper an expansion up to arbitrary order for off-diagonal heat kernels in flat space based on the covariant perturbation expansion is given. In literature, only diagonal heat kernels are calculated based on the covariant perturbation expansion.