Cosmological constraints from unWISE and Planck CMB lensing tomography
  A number of recent, low-redshift, lensing measurements hint at a universe in
which the amplitude of lensing is lower than that predicted from the
$\Lambda$CDM model fit to the data of the Planck CMB mission. Here we use the
auto- and cross-correlation signal of unWISE galaxies and Planck CMB lensing
maps to infer cosmological parameters at low redshift. In particular, we
consider three unWISE samples (denoted as "blue", "green" and "red") at median
redshifts $z \sim 0.6$, $1.1$ and 1.5, which fully cover the Dark Energy
dominated era. Our cross-correlation measurements, with combined significance
$S/N \sim 80$, are used to infer the amplitude of low-redshift fluctuations,
$\sigma_8$; the fraction of matter in the Universe, $\Omega_m$; and the
combination $S_8 \equiv \sigma_8 (\Omega_m / 0.3)^{0.5}$ to which these
low-redshift lensing measurements are most sensitive. The combination of blue,
green and red samples gives a value $S_8=0.784\pm 0.015$, that is fully
consistent with other low-redshift lensing measurements and in 2.4$\sigma$
tension with the CMB predictions from Planck. This is noteworthy, because CMB
lensing probes the same physics as previous galaxy lensing measurements, but
with very different systematics, thus providing an excellent complement to
previous measurements.
