PT Journal
AU Alvarez-Ortega, D
   Olmo, GJ
   Rubiera-Garcia, D
   Saez-Chillon Gomez, D
TI Eternal versus singular observers in interacting dark-energy-dark-matter models
SO Physical Review D
JI Phys. Rev. D
PY 2022
BP 023523
EP 14pp
VL 106
IS 2
DI 10.1103/PhysRevD.106.023523
LA English
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.
ER