2017/11/01 by Adrià Gómez-Valent, Adria Gomez-Valent, Joan Solà +1 · 4 citations
Physics and Astronomy · #Baryon #Baryon acoustic oscillations #COSMIC cancer database #Cosmic background radiation #Cosmic microwave background #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Particle physics theoretical and experimental studies #Scale factor (cosmology) #Universe #Vacuum energy #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1209/0295-5075/120/39001
published as EPL, 120 (2017) 39001 · Version accepted in EPL (Europhys. Lett.) Extended analysis in Fig. 4 and updated references
openalex publication_date 2017/11/01 · openalex created_date 2017/11/10 · arxiv created 2018/01/08 · arxiv updated 2018/02/01 · openalex updated_date 2026/08/05
It has recently been shown that the class of running vacuum models (RVMs) has the capacity to fit the overall cosmological observations better than the concordance ΛCDM model, therefore supporting the possibility of dynamical dark energy (DE). Apart from the cosmic microwave background (CMB) anisotropies, the most crucial datasets involved are: i) baryonic acoustic oscillations (BAO), and ii) direct large scale structure (LSS) formation data. Analyses mainly focusing on CMB and with insufficient BAO + LSS input generally fail to capture the dynamical DE signature, whereas the few existing studies accounting for the wealth of known CMB+BAO+LSS data (see in particular Solà, Gómez-Valent and de Cruz Pérez (2015), (2017); and Zhao et al . (2017)) do converge to the remarkable conclusion that dynamical DE might well be encoded in the current cosmological observations at 3–4 σ c.l. A decisive factor is the persistent σ 8 -tension between the ΛCDM and the data. Because the issue is obviously pressing, we devote this work to explain how and why running vacuum in the expanding universe successfully relaxes the existing σ 8 -tension and describes the LSS formation data significantly better than the ΛCDM.