A technique to build perturbative series for the spectator field’s correlation functions in de Sitter space through the Fokker-Planck equation is proposed. We derive from the first-order differential equation the iterative integral relation for equal- and multi-time correlation functions. With an appropriate integration, the obtained two-point and four-point correlation functions are in agreement with quantum field theory’s ones.
Kamenshchik, A., Petriakova, P. (2025). From the Fokker-Planck equation to perturbative QFT’s results in de Sitter space. JOURNAL OF HIGH ENERGY PHYSICS, 2025(8), 1-17 [10.1007/jhep08(2025)063].
From the Fokker-Planck equation to perturbative QFT’s results in de Sitter space
Kamenshchik, Alexander;Petriakova, Polina
2025
Abstract
A technique to build perturbative series for the spectator field’s correlation functions in de Sitter space through the Fokker-Planck equation is proposed. We derive from the first-order differential equation the iterative integral relation for equal- and multi-time correlation functions. With an appropriate integration, the obtained two-point and four-point correlation functions are in agreement with quantum field theory’s ones.File in questo prodotto:
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