Predicted UV luminosity function (Φ) at z = 11. Our standard ΛCDM model without PBHs (Sect. 2.2; solid orange curve) is compared with models including PBHs with λ_E = 0 (solid black) and λ_E = 1 (solid brown). The shaded regions denote the model uncertainties (16 and 84 percentiles at fixed M_UV). The data from McLeod et al. (2024) and Donnan et al. (2024) at z = 11, and the fit from Bouwens et al. (2022a) to low-z data are also shown as a reference for our fiducial model. The inset shows the percentage of M_UV = −21 galaxies that are hosted by halos of mass M_h for the λ_E = 1 case (brown line); the orange line is instead computed within the ΛCDM model without changing the normalization. Although the LF curves for both values of λ_E agree with data, they differ at the bright end of the LF.