| Full text | |
| Author(s): |
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]
Total Authors: 6
|
| Affiliation: | [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
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | CHINESE JOURNAL OF PHYSICS; v. 72, p. 159-175, AUG 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 16/09831-0 - Neutron Stars populations: bayesian statistics tools |
| Grantee: | Rodolfo Valentim da Costa Lima |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 15/08476-0 - Gravitational waves in f(R,T) theories: polarization states and astrophysical sources |
| Grantee: | Pedro Henrique Ribeiro da Silva Moraes |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 18/20689-7 - Gauss-Bonnet Stars |
| Grantee: | Pedro Henrique Ribeiro da Silva Moraes |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| FAPESP's process: | 17/05859-0 - The accelerating universe: nature and tests of dark energy and dark matter |
| Grantee: | José Fernando de Jesus |
| Support Opportunities: | Regular Research Grants |