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Over the past year, JWST has uncovered galaxies at record-breaking distancesup to $z \sim 13$. The JWST UNCOVER (ultra-deep NIRSpec and NIRcam observationsbefore the epoch of reionization) program has obtained ultra-deepmultiwavelength NIRCam imaging of the massive galaxy cluster Abell 2744 over$\sim 45$ arcmin$^{2}$ down to $\sim 29.5$ AB mag. Here, we present a robustultraviolet (UV) luminosity function derived through lensing clusters at$9<z<12$. Using comprehensive end-to-end simulations, we account for alllensing effects and systematic uncertainties in deriving both the amplificationfactors and the effective survey volume. Our results confirm the intriguingexcess of UV-bright galaxies ($M_{UV} < -20$ AB mag) previously reported at$z>9$ in recent JWST studies. In particular, a double power-law (DPL) describesbetter the bright-end of the luminosity function compared to the classicalSchechter form. The number density of these bright galaxies is 10-100 timeslarger than theoretical predictions and previous findings based on Hubble SpaceTelescope (HST) observations. Additionally, we measure a star formation ratedensity of $\rho_{\rm SFR} = 10^{-2.64}$ M$_{\odot}$ yr$^{-1}$ Mpc$^{-3}$ atthese redshifts, which is 4 to 10 times higher than galaxy formation modelsthat assume a constant star formation efficiency. Future wide-area surveys andaccurate modeling of lensing-assisted observations will reliably constrain boththe bright and the dim end of the UV luminosity function at $z>9$, which willprovide key benchmarks for galaxy formation models.

JWST UNCOVER: The Overabundance of Ultraviolet-luminous Galaxies at $z>9$