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Álvarez Ortega, Diego and Olmo, Gonzalo J. and Rubiera García, Diego and Sáez Chillón Gómez, Diego
(2022)
*Eternal versus singular observers in interacting dark-energy-dark-matter models.*
Physical review D, 106
(2).
ISSN 2470-0010

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Official URL: http://dx.doi.org/10.1103/PhysRevD.106.023523

## Abstract

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.

Item Type: | Article |
---|---|

Additional Information: | © 2022 Amer Physical Soc. |

Uncontrolled Keywords: | Baryon acoustic oscillations; Inflation; Forest. |

Subjects: | Sciences > Physics > Physics-Mathematical models Sciences > Physics > Mathematical physics |

ID Code: | 74539 |

Deposited On: | 23 Sep 2022 17:56 |

Last Modified: | 26 Sep 2022 07:24 |

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