On (dis)agreement between different methods of calculation of the imaginary part of the effective action in expanding space-times

On (dis)agreement between different methods of calculation of the imaginary part of the effective action in expanding space-times

We consider two approaches to calculate imaginary parts of effective actions in expanding space-times. While the first approach uses Bogolyubov coefficients, the second one uses the functional integral or the Feynman propagator. In eternally expanding space-times these two approaches give different...

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Bibliographic Details
Main Authors: E.T. Akhmedov, I.A. Belkovich, D.V. Diakonov, K.A. Kazarnovskii
Format: Article
Language:English
Published: Elsevier 2025-02-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269325000164
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