TY  - JOUR
AU  - Alvarez-Ortega, D.
AU  - Olmo, G. J.
AU  - Rubiera-Garcia, D.
AU  - Saez-Chillon Gomez, D.
PY  - 2022
DA  - 2022//
TI  - Eternal versus singular observers in interacting dark-energy-dark-matter models
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 023523
EP  - 14pp
VL  - 106
IS  - 2
PB  - Amer Physical Soc
AB  - 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.
SN  - 2470-0010
UR  - https://arxiv.org/abs/2204.11676
UR  - https://doi.org/10.1103/PhysRevD.106.023523
DO  - 10.1103/PhysRevD.106.023523
LA  - English
N1  - WOS:000842768300012
ID  - Alvarez-Ortega_etal2022
ER  -