Authors:	Ferrero, Renata Ripken, Chris
Title:	De Sitter scattering amplitudes in the Born approximation
Online publication date:	20-Jun-2023
Year of first publication:	2022
Language:	english
Abstract:	We present a covariant framework to compute scattering amplitudes and potentials in a de Sitter background. In this setting, we compute the potential of a graviton-mediated scattering process involving two very massive scalars at tree level. Although the obtained scattering potential reproduces the Newtonian potential at short distances, on Hubble- size length scales it is affected by the constant curvature: effectively, it yields a repulsive force at sub-Hubble distances. This can be attributed to the expansion of the de Sitter universe. Beyond the de Sitter horizon, the potential vanishes identically. Hence, the scattering amplitude unveils the geometric properties of de Sitter spacetime in a novel and nontrivial way.
DDC:	530 Physik 530 Physics
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 08 Physik, Mathematik u. Informatik
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-8853
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	SciPost physics 13 5
Pages or article number:	106
Publisher:	SciPost Foundation
Publisher place:	Amsterdam
Issue date:	2022
ISSN:	2542-4653
Publisher DOI:	10.21468/SciPostPhys.13.5.106
Appears in collections:	DFG-491381577-D