%0 Journal Article
%T Eternal versus singular observers in interacting dark-energy-dark-matter models
%A Alvarez-Ortega, D.
%A Olmo, G. J.
%A Rubiera-Garcia, D.
%A Saez-Chillon Gomez, D.
%J Physical Review D
%D 2022
%V 106
%N 2
%I Amer Physical Soc
%@ 2470-0010
%G English
%F Alvarez-Ortega_etal2022
%O WOS:000842768300012
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5345), last updated on Mon, 05 Sep 2022 09:46:24 +0000
%X Interacting dark-energy-dark-matter models have been widely analyzed in the literature in an attempt to find traces of new physics beyond the usual cosmological (Lambda CDM) models. Such a coupling between both dark components is usually introduced in a phenomenological way through a flux in the continuity equation. However, models with a Lagrangian formulation are also possible. A class of the latter assumes a conformal/disformal coupling that leads to a fifth force on the dark-matter component, which consequently does not follow the same geodesics as the other (baryonic, radiation, and dark-energy) matter sources. Here we analyze how the usual cosmological singularities of the standard matter frame are seen from the dark-matter one, concluding that by choosing an appropriate coupling, dark-matter observers will see no singularities but a non beginning, non ending universe. By considering two simple phenomenological models we show that such a type of coupling can fit observational data as well as the usual Lambda CDM model.
%R 10.1103/PhysRevD.106.023523
%U https://arxiv.org/abs/2204.11676
%U https://doi.org/10.1103/PhysRevD.106.023523
%P 023523-14pp