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We analyze the evolution of massive (log$_{10}$ [$M_\star/M_\odot$] $>10$)galaxies at $z \sim$ 4--8 selected from the JWST Cosmic Evolution Early ReleaseScience (CEERS) survey. We infer the physical properties of all galaxies in theCEERS NIRCam imaging through spectral energy distribution (SED) fitting withdense basis to select a sample of high redshift massive galaxies. Whereavailable we include constraints from additional CEERS observing modes,including 18 sources with MIRI photometric coverage, and 28 sources withspectroscopic confirmations from NIRSpec or NIRCam wide-field slitlessspectroscopy. We sample the recovered posteriors in stellar mass from SEDfitting to infer the volume densities of massive galaxies across cosmic time,taking into consideration the potential for sample contamination by activegalactic nuclei (AGN). We find that the evolving abundance of massive galaxiestracks expectations based on a constant baryon conversion efficiency in darkmatter halos for $z \sim$ 1--4. At higher redshifts, we observe an excessabundance of massive galaxies relative to this simple model. These higherabundances can be explained by modest changes to star formation physics and/orthe efficiencies with which star formation occurs in massive dark matter halos,and are not in tension with modern cosmology.

Evidence for a Shallow Evolution in the Volume Densities of Massive Galaxies at $z=4$ to $8$ from CEERS