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Issue 9, 2024
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On the 90th anniversary of the Lebedev Physics Institute of the Russian Academy of Sciences (LPI). Reviews of topical problems


Schwinger—DeWitt technique in quantum gravity

†  a, b, ‡  a
a Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
b Institute of Theoretical and Mathematical Physics, Lomonosov Moscow State University, Lomonosovskii prosp. 27, korp. 1, Moscow, 119192, Russian Federation

This paper consists of two parts. The first is a review of the classical Schwinger—DeWitt technique for calculating the effective action in quantum field theory and quantum gravity. We systematically present the background field and heat kernel methods and the calculation of heat kernel coefficients for minimal second-order operators, and apply these methods to calculations of the divergent part of the one-loop effective action. We then discuss the method of universal functional traces, which is also applicable to higher-order minimal and nonminimal operators. In the second part, we discuss new results obtained recently on off-diagonal heat kernel expansions for higher-order minimal operators. These expansions, which generalize the standard DeWitt ansatz, are shown to have the form of a double functional series in some new special functions, which we call the generalized exponential functions. The properties of these functions and expansions constructed from them are discussed in detail, including the presence of terms with arbitrarily large negative powers of the proper time. Finally, we discuss two different covariant methods for calculating the coefficients of off-diagonal expansions: a generalized Fourier transformation and the perturbation theory.

Typically, an English full text is available in about 1 month from the date of publication of the original article.

Keywords: Schwinger—DeWitt technique, proper-time method, heat kernel, effective action, higher-order theories, off-diagonal expansions
PACS: 03.70.+k, 04.60.+m, 11.10.−z (all)
DOI: 10.3367/UFNe.2024.02.039646
URL: https://ufn.ru/en/articles/2024/8/b/
Citation: Barvinsky A O, Vakhovsky V N "Schwinger—DeWitt technique in quantum gravity" Phys. Usp. 67 (8) (2024)

Received: 30th, October 2023, revised: 30th, January 2024, 16th, February 2024

Оригинал: Барвинский А О, Ваховский В Н «Техника Швингера—ДеВитта в квантовой гравитации» УФН 194 795–813 (2024); DOI: 10.3367/UFNr.2024.02.039646

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