BD-$\Lambda$CDM and Running Vacuum Models: Theoretical background and current observational status

Autor:	Perez, Javier de Cruz, Peracaula, Joan Sola, Gomez-Valent, Adria, Moreno-Pulido, Cristian
Rok vydání:	2021
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory
Druh dokumentu:	Working Paper
Popis:	We present an analysis of the Brans-Dicke cosmological model with a cosmological constant and cold dark matter (BD-$\Lambda$CDM). We find that the BD-$\Lambda$CDM is favored by the overall cosmological data (SNIa+BAO+$H(z)$+LSS+CMB) when it is compared with the standard model of cosmology. The BD-$\Lambda$CDM model can be viewed from the GR perspective as a Running Vacuum Model (RVM) with a time evolving vacuum energy density. Due to this fact and also to its time evolving effective gravitational coupling, the model can alleviate the $\sigma_8$ and the $H_0$ tensions at a time. We also present the results for different types of RVM's when they are tested in the light of the cosmological data and we show that a mild dynamics for the vacuum energy density can help to smooth out the aforementioned tensions, thus improving the performance of $\Lambda$CDM model. Comment: 18 pages, 1 figure. arXiv admin note: text overlap with arXiv:2102.12758
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2110.07569 Zobrazit plný text záznamu View this record from Arxiv