2021/10/14 by Perez, Javier de Cruz, Peracaula, Joan Sola, Gomez-Valent, Adria +1
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)
paper · doi:10.48550/arxiv.2110.07569
We present an analysis of the Brans-Dicke cosmological model with a cosmological constant and cold dark matter (BD-ΛCDM). We find that the BD-ΛCDM 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-ΛCDM 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 σ8 and the H0 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 ΛCDM model.