TheHaloMod: An online calculator for the halo model

The halo model is a successful framework for describing the distribution of matter in the Universe — from weak lensing observables to galaxy n-point correlation functions. We review the basic formulation of the halo model and several of its components in the context of galaxy 2-point statistics, developing a coherent framework for its application. We use this framework to motivate the presentation of a new python tool for simple and efficient calculation of halo model quantities, and their extension to galaxy statistics via a halo occupation distribution, called halomod. This tool is efficient, simple to use, comprehensive and importantly provides a great deal of flexibility in terms of custom extensions. This python tool is complemented by a new web-application at https://thehalomod.app that supports the generation of many halo model quantities directly from the browser — useful for educators, students, theorists and observers.