Redshift evolution of Lyman continuum escape fraction after JWST

The LyC escape fraction from galaxies, $f_{\rm esc}$, is strongly boosted by galactic outflows. In the Attenuation-Free Model (AFM) accounting for the properties of $z>10$ galaxies, radiation-driven outflows develop once the galaxy specific star formation rate, $\rm sSFR \ge \rm sSFR^* \simeq 25\ \rm Gyr^{-1}$. As the cosmic sSFR increases with redshift, so does $f_{\rm esc}(z)$, which, when globally averaged, grows from 0.007 to 0.6 in $0 < z < 20$. We successfully tested the model on specific data sub-samples. Our predictions are consistent with measurements of $f_{\rm esc}$ \textbf{up to $z=9.5$}, and provide a physical explanation for the observed decreasing trend of the mean UV galaxy spectral slope, $\beta$, towards high-$z$.