Regular Article – Theoretical Physics
Unphysical properties in a class of interacting dark energy models
Observatório Nacional, 20921-400, Rio de Janeiro, RJ, Brazil
2 Départment de Physique Théorique and Centre for Astroparticle Physics, Université de Genève, Quai E. Ansermet 24, 1211, Geneva 4, Switzerland
3 Instituto de Física, Universidade Federal da Bahia, 40210-340, Salvador, BA, Brazil
4 PPGCosmo, CCE, Universidade Federal do Espírito Santo, 29075-910, Vitória, ES, Brazil
Accepted: 19 November 2020
Published online: 3 December 2020
Models with non-gravitational interactions between the dark matter and dark energy components are an alternative to the standard cosmological scenario. These models are characterized by an interaction term, and a frequently used parameterization is , where H is the Hubble parameter and is the dark energy density. Although recent analyses have reported that this particular scenario provides a potential solution to the and tensions for negative values of the interaction parameter , we show here that such an interval of values of leads to a violation of the Weak Energy Condition for the dark matter density, which is accompanied by unphysical instabilities of matter perturbations. Using current observational data we also show that the inclusion of the physical prior in the statistical analysis alters the parameter selection for this model and discards it as a solution for the -tension problem.
© The Author(s) 2020
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3