6533b852fe1ef96bd12aadb9
RESEARCH PRODUCT
Eternal versus singular observers in interacting dark-energy-dark-matter models
Diego ÁLvarez-ortegaGonzalo J. OlmoDiego Rubiera-garciaDiego Sáez-chillón Gómezsubject
Cosmology and Nongalactic Astrophysics (astro-ph.CO)Física-Modelos matemáticosFOS: Physical sciencesFísica matemáticaGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics::Cosmology and Extragalactic AstrophysicsGeneral Relativity and Quantum CosmologyAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
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 (ΛCDM) 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 ΛCDM model.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2022-07-26 |