  The bias of dark matter halos and galaxies is a crucial quantity in many
cosmological analyses. In this work, using large cosmological simulations, we
explore the halo mass function and halo bias within cosmic voids. For the first
time to date, we show that they are scale-dependent along the void profile, and
provide a predictive theoretical model of both the halo mass function and halo
bias inside voids, recovering for the latter and 1% accuracy against simulated
data. These findings may help shed light on the dynamics of halo formation
within voids and improve the analysis of several void statistics from ongoing
and upcoming galaxy surveys.
