New Algebraic Methods for Calculating the Heat Kernel and Effective Action in Quantum Gravity and Gauge Theories

Details New Algebraic Methods for Calculating the Heat Kernel and Effective Action in Quantum Gravity and Gauge Theories New Algebraic Methods for Calculating the Heat Kernel and Effective Action in Quantum Gravity and Gauge Theories

1994-08-24

arxiv.org/abs/gr-qc/9408028v1

in: Heat Kernel Techniques and Quantum Gravity, Ed. S. A. Fulling, Discourses in Mathematics and Its Applications, (College St

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

22 pages, Plain TeX, University of Greifswald (August, 1994)

Scientific paper

An overview about recent progress in the calculation of the heat kernel and the one-loop effective action in quantum gravity and gauge theories is given. We analyse the general structure of the standard Schwinger-De Witt asymptotic expansion and discuss the applicability of that to the case of strongly curved manifolds and strong background fields. We argue that the low-energy limit in gauge theories and quantum gravity, when formulated in a covariant way, should be related to background fields with covariantly constant curvature, gauge field strength and potential term. It is shown that the condition of the covariant constancy of the background curvatures brings into existence some Lie algebra. The heat kernel operator for the Laplace operator is presented then as an average over the corresponding Lie group with some nontrivial Gaussian measure. Using this representation the heat kernel diagonal is obtained. The result is expressed purely in terms of curvature invariants and is explicitly covariant. Related topics concerning the structure of symmetric spaces and the calculation of the effective action are discussed.

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