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Can dark matter–dark energy interaction alleviate the cosmic coincidence problem?

dc.contributor.authorJesus, J. F. [UNESP]
dc.contributor.authorEscobal, A. A. [UNESP]
dc.contributor.authorBenndorf, D. [UNESP]
dc.contributor.authorPereira, S. H. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-04-29T08:41:25Z
dc.date.available2022-04-29T08:41:25Z
dc.date.issued2022-03-01
dc.description.abstractIn this paper we study a model of interacting dark energy–dark matter where the ratio between these components is not constant, changing from early to late times in such a way that the model can solve or alleviate the cosmic coincidence problem (CP). The interaction arises from an assumed relation of the form ρx∝ρdα, where ρx and ρd are the energy densities of dark energy and dark matter components, respectively, and α is a free parameter. For a dark energy equation of state parameter w= - 1 we found that, if α= 0 , the standard Λ CDM model is recovered, where the coincidence problem is unsolved. For 0 < α< 1 , the CP would be alleviated and for α∼ 1 , the CP would be solved. The dark energy component is analyzed with both w= - 1 and w≠ - 1. Using Supernovae type Ia and Hubble parameter data constraints, in the case w= - 1 we find α=0.109-0.072+0.062 at 68% C.L., and the CP is alleviated. For w≠ - 1 , a degeneracy arises on the w–α plane. In order to break such degeneracy we add cosmic microwave background distance priors and baryonic acoustic oscillations data to the constraints, yielding α= - 0.075 ± 0.046 at 68% C.L. In this case we find that the CP is not alleviated even for 2σ interval for α. Furthermore, this last model is discarded against flat Λ CDM according to BIC analysis.en
dc.description.affiliationInstituto de Ciências e Engenharia Universidade Estadual Paulista (UNESP), R. Geraldo Alckmin 519, SP
dc.description.affiliationDepartamento de Física Faculdade de Engenharia de Guaratinguetá Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha 333, SP
dc.description.affiliationUnespInstituto de Ciências e Engenharia Universidade Estadual Paulista (UNESP), R. Geraldo Alckmin 519, SP
dc.description.affiliationUnespDepartamento de Física Faculdade de Engenharia de Guaratinguetá Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha 333, SP
dc.identifierhttp://dx.doi.org/10.1140/epjc/s10052-022-10234-y
dc.identifier.citationEuropean Physical Journal C, v. 82, n. 3, 2022.
dc.identifier.doi10.1140/epjc/s10052-022-10234-y
dc.identifier.issn1434-6052
dc.identifier.issn1434-6044
dc.identifier.scopus2-s2.0-85127416496
dc.identifier.urihttp://hdl.handle.net/11449/230664
dc.language.isoeng
dc.relation.ispartofEuropean Physical Journal C
dc.sourceScopus
dc.titleCan dark matter–dark energy interaction alleviate the cosmic coincidence problem?en
dc.typeArtigo
unesp.departmentFísica e Química - FEGpt

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