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

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorJesus, J. F.-
Autor(es): dc.creatorEscobal, A. A.-
Autor(es): dc.creatorBenndorf, D.-
Autor(es): dc.creatorPereira, S. H.-
Data de aceite: dc.date.accessioned2025-08-21T18:36:59Z-
Data de disponibilização: dc.date.available2025-08-21T18:36:59Z-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-03-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1140/epjc/s10052-022-10234-y-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/230664-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/230664-
Descrição: dc.descriptionIn 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.-
Descrição: dc.descriptionInstituto de Ciências e Engenharia Universidade Estadual Paulista (UNESP), R. Geraldo Alckmin 519, SP-
Descrição: dc.descriptionDepartamento de Física Faculdade de Engenharia de Guaratinguetá Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha 333, SP-
Descrição: dc.descriptionInstituto de Ciências e Engenharia Universidade Estadual Paulista (UNESP), R. Geraldo Alckmin 519, SP-
Descrição: dc.descriptionDepartamento de Física Faculdade de Engenharia de Guaratinguetá Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha 333, SP-
Idioma: dc.languageen-
Relação: dc.relationEuropean Physical Journal C-
???dc.source???: dc.sourceScopus-
Título: dc.titleCan dark matter–dark energy interaction alleviate the cosmic coincidence problem?-
Tipo de arquivo: dc.typelivro digital-
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