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The epochs of cosmic dawn and reionisation present promising avenues forunderstanding the role of dark matter (DM) in our cosmos. The first galaxiesthat populated the Universe during these eras resided in DM halos that weremuch less massive than their counterparts today. Consequently, observations ofsuch galaxies can provide us with a handle on the clustering of DM in anotherwise currently inaccessible regime. In this work, we use high-redshift UVgalaxy luminosity-function (UV LF) data from the Hubble Space Telescope tostudy the clustering properties of DM at small scales. In particular, wepresent new measurements of the matter power spectrum at wavenumbers$0.5\,\mathrm{Mpc}^{-1} < k < 10\,\mathrm{Mpc}^{-1}$ to roughly 30% precision,obtained after marginalising over the unknown astrophysics. These new datapoints cover the uncharted redshift range $4\leq z\leq 10$ and encompass scalesbeyond those probed by Cosmic-Microwave-Background and large-scale-structureobservations. This work establishes the UV LF as a powerful tool to probe thenature of DM in a different regime than other cosmological and astrophysicaldata sets.

New Roads to the Small-Scale Universe: Measurements of the Clustering of Matter with the High-Redshift UV Galaxy Luminosity Function