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 h ^ { -1 } { Mpc } , 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 .