Dark sector interaction: a remedy of the tensions between CMB and LSS data

• Published in: The European physical journal. C, Particles and fields Vol. 79; no. 7; pp. 1 - 5
• Main Authors: Kumar, Suresh, Nunes, Rafael C., Yadav, Santosh Kumar
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2019; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Analysis; Astronomy; Astrophysics and Cosmology; Cosmology; Coupling; Dark energy; Dark matter; Dark matter (Astronomy); Elementary Particles; Hadrons; Heavy Ions; Letter; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; String Theory; Universe
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-019-7087-7

The well-known tensions on the cosmological parameters H 0 and σ 8 within the Λ CDM cosmology shown by the Planck-CMB and LSS data are possibly due to the systematics in the data or our ignorance of some new physics beyond the Λ CDM model. In this letter, we focus on the second possibility, and investigate a minimal extension of the Λ CDM model by allowing a coupling between its dark sector components (dark energy and dark matter). We analyze this scenario with Planck-CMB, KiDS and HST data, and find that the H 0 and σ 8 tensions disappear. In the joint analyses with Planck, HST and KiDS data, we find non-zero coupling in the dark sector up to 99% CL. Thus, we find a strong statistical support from the observational data for an interaction in the dark sector of the Universe while solving the H 0 and σ 8 tensions simultaneously.