Year: 2026
Type: preprint
Abstract: We construct an observer-centric S-matrix in the expanding Poincaré patch of four-dimensional de Sitter space. The asymptotic states are defined along the worldline of a comoving, or eternal, observer, the only kind of geodesic observer that remains in the patch for all proper time, and the free Hamiltonian is the conserved charge generating translations in her proper time. The resulting S-matrix is independent of which eternal observer is chosen. We apply the construction to pure Yang--Mills theory in Coulomb gauge and compute the three- and four-gluon amplitudes at tree level. The amplitudes have a structure similar to the cosmological correlators of gauge currents and are constrained by the Ward identities of de Sitter isometries.
Source: arXiv (Cornell University)
Authors: Lindsay, Audrey, Taylor, Tomasz R.
Institutions: Northeastern University, University of Warsaw
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7222763128