Bias to CMB lensing measurements from the bispectrum of large-scale structure

CMB lensing probes the growth of the large-scale structure (LSS) of the universe. The authors analytically quantify the effect of non-linearities in the LSS formation on CMB lensing, which leads to a so far neglected bias. With the precision of future experiments (S00ext00exa00exg00exe-I00exI00exI, S00ext00exa00exg00exe-I00exV), this bias will significantly shift the measured power spectra and must be accounted for.