摘要
High- to ultrahigh-redshift clustering of halos provides a powerful tool to understand cosmology and galaxy formation. However, theoretical predictions are not firmly established in the first billion years, where current and upcoming surveys are beginning to reach percent-level precision. Here we measure dark matter halo biases atz=6- 19 from simulation data, and find they are∼3 - 4 %higher than canonical results calibrated at lowz . We provide an updated linear-bias fit at these early times, reducing the mean systematic offset to< 1% . These results will enable robust interpretation of early-Universe galaxy clustering from JWST, Roman, and intensity-mapping surveys.