Even the photon propagator must break de Sitter symmetry

0572395 - FZÚ 2024 RIV NL eng J - Článek v odborném periodiku
Glavan, Dražen - Prokopec, T.
Even the photon propagator must break de Sitter symmetry.
Physics Letters. B. Roč. 841, June (2023), č. článku 137928. ISSN 0370-2693. E-ISSN 1873-2445
Grant CEP: GA ČR(CZ) GA20-28525S
Institucionální podpora: RVO:68378271
Klíčová slova: de Sitter space * early universe particle physics * gauge symmetry * non- equilibrium field theory
Obor OECD: Particles and field physics
Impakt faktor: 4.3, rok: 2022
Způsob publikování: Open access

The propagator for the massless vector field in de Sitter space cannot maintain de Sitter invariance in the general covariant gauge, except in the exactly transverse limit. This is due to a previously overlooked Ward-Takahashi identity that the propagator must satisfy. We construct the propagator that satisfies all the necessary conditions, and that preserves cosmological symmetries and dilation, but breaks spatial special conformal transformations. Our propagator vanishes in the infrared, contrary to previously reported de Sitter invariant results, which is relevant for loop computations.
Trvalý link: https://hdl.handle.net/11104/0348517