Relic neutrinos in silico

This thesis investigates the gravitational clustering effects on the cosmic neutrino background (CNB), a sea of relic particles predicted by cosmology but not yet directly detected. We developed a simulation framework to bridge the gap between analytical models and large-scale simulations, addressing three fundamental questions about the CNB's number density at Earth, directional dependence, and temporal constancy over the year. By populating our simulation space with dark matter halos extracted from cosmological N-body simulations, we discovered previously unknown phenomenological consequences that depend on the specific dark matter halo environments considered. These findings reveal that gravitational clustering effects on the CNB are more complex than previously anticipated, with important implications for the design and interpretation of future direct detection experiments such as PTOLEMY.