Cosmic viscosity as a remedy for tension between PLANCK and LSS data
Anand, Sampurn; Chaubal, Prakrut; Mazumdar, Arindam; Mohanty, Subhendra
India
Abstract
Measurements of σ8 from large scale structure observations show a discordance with the extrapolated σ8 from Planck CMB parameters using ΛCDM cosmology. Similar discordance is found in the value of H0 and Ωm. In this paper, we show that the presence of viscosity, shear or bulk or combination of both, can remove the above mentioned conflicts simultaneously. This indicates that the data from Planck CMB observation and different LSS observations prefer small but non-zero amount of viscosity in cold dark matter fluid.