| Texto completo | |
| Autor(es): |
Lapola, M. M.
[1]
;
Moraes, P. H. R. S.
[1, 2]
;
de Paula, W.
[1]
;
Jesus, J. F.
[3]
;
Valentim, R.
[4]
;
Malheiro, M.
[1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] ITA Inst Tecnol Aeronaut, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, BR-05508090 Sao Paulo, SP - Brazil
[3] Univ Estadual Paulista Unesp, Campus Expt Itapeva R Geraldo Alckmin 519, BR-18409010 Itapeva, SP - Brazil
[4] Univ Fed Sao Paulo UNIFESP, Inst Ciencias Ambientais Quim & Farmaceut ICAQF, Dept Fis, Rua Sao Nicolau 210, BR-09913030 Diadema, SP - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CHINESE JOURNAL OF PHYSICS; v. 72, p. 159-175, AUG 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
We present a five dimensional cosmological metric that reveals a four-dimensional energy-momentum tensor. We analyse three cases for the resulting field equations: null, positive and negative cosmological constant Lambda. For the case with null cosmological constant, we obtain a solution able to describe the radiation-dominated era of the universe. The positive five-dimensional cosmological constant case yields a bounce cosmological model. In the negative Lambda case, the scale factor for the line element is obtained as a(t) = c(5)root sinh(root 2/3 vertical bar Lambda vertical bar t) , where c(5) is a constant. This solution can remarkably describe not only the late-time cosmic acceleration but also the non-accelerated stages of the cosmic expansion, namely the radiation and matter dominated epochs in a continuous form. We obtain an analytical equation of state capable of describing the different epochs of the universe and it reads as p = omega(z)rho with omega(z) = 1/3{[}1 - 4/1+c(5)(4)(1+z)(4)], with p being the pressure of the universe, rho its density and z is the redshift. In our model the constant c(5) is related to the Hubble constant as H-0 = root vertical bar Lambda vertical bar/6coth{[}arcsinh(1/c(5))(2)] and this satisfactorily fits the observational data for the low redshift sample of the experimental measurements of the Hubble parameter, which results in H-0 = 72.2(-5.5)(+5.3) km s(-1) Mpc(-1) and c(5) = 0.600(-0.058)(+0.061). (AU) | |
| Processo FAPESP: | 16/09831-0 - Populações de Estrelas de Nêutrons: ferramentas estatísticas bayesianas |
| Beneficiário: | Rodolfo Valentim da Costa Lima |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 15/08476-0 - Ondas gravitacionais em teorias f(R,T): estados de polarização e fontes astrofísicas |
| Beneficiário: | Pedro Henrique Ribeiro da Silva Moraes |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 18/20689-7 - Estrelas de Gauss-Bonnet |
| Beneficiário: | Pedro Henrique Ribeiro da Silva Moraes |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |
| Processo FAPESP: | 17/05859-0 - O universo acelerado: natureza e testes da energia escura e matéria escura |
| Beneficiário: | José Fernando de Jesus |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |