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 (S0{0ex}t0{0ex}a0{0ex}g0{0ex}e-I0{0ex}I0{0ex}I, S0{0ex}t0{0ex}a0{0ex}g0{0ex}e-I0{0ex}V), this bias will significantly shift the measured power spectra and must be accounted for.