The lensing and temperature imprints of voids on the Cosmic Microwave
  Background
  We have searched for the signature of cosmic voids in the CMB, in both the
Planck temperature and lensing-convergence maps; voids should give decrements
in both. We use zobov voids from the DR12 SDSS CMASS galaxy sample. We base our
analysis on N-body simulations, to avoid a posteriori bias. For the first time,
we detect the signature of voids in CMB lensing: the significance is
$3.2\sigma$, close to $\Lambda$CDM in both amplitude and projected
density-profile shape. A temperature dip is also seen, at modest significance
($2.3\sigma$), with amplitude about 6 times the prediction. This temperature
signal is induced mostly by voids with radius between 100 and 150 Mpc/h, while
the lensing signal is mostly contributed by smaller voids -- as expected;
lensing relates directly to density, while ISW depends on gravitational
potential. The void abundance in observations and simulations agree, as well.
We also repeated the analysis excluding lower-significance voids: no lensing
signal is detected, with an upper limit of about twice the $\Lambda$CDM
prediction. But the mean temperature decrement now becomes non-zero at the
$3.7\sigma$ level (similar to that found by Granett et al.), with amplitude
about 20 times the prediction. However, the observed dependence of temperature
on void size is in poor agreement with simulations, whereas the lensing results
are consistent with $\Lambda$CDM theory. Thus, the overall tension between
theory and observations does not favour non-standard theories of gravity,
despite the hints of an enhanced amplitude for the ISW effect from voids.
