fleshed out the introductory sections

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#import "helpers.typ": *
= Abstract
We present refinements to the BEoRN framework, a semi-numerical simulation suite that generates 21-cm maps of the cosmic dawn and the epoch of reionization. The refinements include a self-consistent treatment of the evolution of individual sources, which allows for a more accurate prediction of the 21-cm signal.
We validate the refined suite against ?? and quantify the gain in consistency resulting from the more accurate treatment of the sources.
We present an updated version of the #beorn framework, a semi-numerical simulation suite that generates maps of the cosmic dawn and the epoch of reionization. The refinements include a self-consistent treatment of the evolution of individual galaxies, a parametrization of stochasticity of the mass accretion rate, and a general optimization that allows for speedier simulation runs.
We validate the improved version of the suite against ??. We employ the Thesan-Dark simulation to inder halo mass history and demonstrate the effect of this more detailed treatment.