Joanne Jones

Disentangling constraints on $S_8$ from the high and low redshift CMB

The clustering of matter in the universe is quantified by $\sigma_8$, the RMS fluctuations today in linear theory in spheres of radius $8h^{-1}$ Mpc, where $h$ parametrizes the Hubble constant. Surveys of gravitational lensing and galaxy clustering best constrain $S_8\equiv (\Omega_m/0.3)^{0.5} \sigma_8$, where $\Omega...