Eur. Phys. J. C (2018) 78: 769
https://doi.org/10.1140/epjc/s10052-018-6258-2

Letter

Integral representation of the Feynman propagators of the Dirac fermions on the de Sitter expanding universe

West University of Timişoara, V. Pârvan Ave. 4, 300223, Timisoara, Romania

^* e-mail: i.cotaescu@e-uvt.ro

Received: 20 May 2018
Accepted: 18 September 2018
Published online: 25 September 2018

Abstract

The propagators of the Dirac fermions on the expanding portion of the -dimensional de Sitter spacetime are considered as mode sums in momentum representation with a fixed vacuum of Bunch–Davies type. The principal result reported here is a new integral representation of the Feynman propagators of the massive and left-handed massless Dirac fields which can be used for deriving the Feynman rules of de Sitter QED in the Coulomb gauge or of an extended QFT.