Dark sector interaction: a remedy of the tensions between CMB and LSS data
Department of Mathematics, BITS Pilani, Pilani Campus, Pilani, Rajasthan, 333031, India
2 Divisão de Astrofísica, Instituto Nacional de Pesquisas Espaciais, Avenida dos Astronautas 1758, São José dos Campos, SP, 12227-010, Brazil
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Accepted: 28 June 2019
Published online: 9 July 2019
The well-known tensions on the cosmological parameters and within the 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 CDM model. In this letter, we focus on the second possibility, and investigate a minimal extension of the 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 and 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 and tensions simultaneously.
© The Author(s), 2019