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Acting as powerful gravitational lenses, the strong lensing galaxy clustersof the deep Hubble Frontier Fields (HFF) program permit access tolower-luminosity galaxies lying at higher redshifts than hitherto possible. Weanalyzed the HFF to measure the volume density of Lyman-break galaxies at $z >4.75$ by identifying a complete and reliable sample up to $z \simeq 10$. Amarked deficit of such galaxies was uncovered in the highly magnified regionsof the clusters relative to their outskirts, implying that the magnification ofthe sky area dominates over additional faint galaxies magnified above the fluxlimit. This negative magnification bias is consistent with a slow rollover atthe faint end of the UV luminosity function, and indicates a preference forBose-Einstein condensate dark matter with a light boson mass of $m_\mathrm{B}\simeq 10^{-22} \, \mathrm{eV}$ over standard cold dark matter. We emphasizethat measuring the magnification bias requires no correction for multiplylensed images (with typically three or more images per source), whereasdirectly reconstructing the luminosity function will lead to an overestimateunless such images can be exhaustively matched up, especially at the faint endthat is accessible only in the strongly lensed regions. In addition, wedetected a distinctive downward transition in galaxy number density at $z\gtrsim 8$, which may be linked to the relatively late reionization reported byPlanck. Our results suggests that JWST will likely peer into an "abyss" withessentially no galaxies detected in deep NIR imaging at $z > 10$.

Magnification Bias of Distant Galaxies in the Hubble Frontier Fields: Testing Wave vs. Particle Dark Matter Predictions