| Autor: |
H. A. P. Macedo, L. S. Brito, J. F. Jesus, M. E. S. Alves |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
European Physical Journal C: Particles and Fields, Vol 83, Iss 12, Pp 1-13 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1434-6052 |
| DOI: |
10.1140/epjc/s10052-023-12321-0 |
| Popis: |
Abstract Problems with the concordance cosmology $$\Lambda $$ Λ CDM as the cosmological constant problem, coincidence problems and Hubble tension has led to many proposed alternatives, as the $$\Lambda (t)$$ Λ ( t ) CDM, where the now called $$\Lambda $$ Λ cosmological term is allowed to vary due to an interaction with pressureless matter. Here, we analyze one class of these proposals, namely, $$\Lambda =\alpha 'a^{-2}+\beta H^2+\lambda _*$$ Λ = α ′ a - 2 + β H 2 + λ ∗ , based on dimensional arguments. Using SNe Ia, cosmic chronometers data plus constraints on $$H_0$$ H 0 from SH0ES and Planck satellite, we constrain the free parameters of this class of models. By using the Planck prior over $$H_0$$ H 0 , we conclude that the $$\lambda _*$$ λ ∗ term can not be discarded by this analysis, thereby disfavouring models only with the time-variable terms. The SH0ES prior over $$H_0$$ H 0 has an weak evidence in this direction. The subclasses of models with $$\alpha '=0$$ α ′ = 0 and with $$\beta =0$$ β = 0 can not be discarded by this analysis. Finally, by using distance priors from CMB, the $$\Lambda $$ Λ time-dependence was quite restricted. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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