Speaker
Description
Neutrinos offer a promising window into new physics, and recent data prompt a re-evaluation of their role in the early universe. Neutrino (ν) portals facilitate thermal dark matter (DM) production, representing one of the few remaining benchmarks in the freeze-out paradigm, yet they remain exceptionally difficult to probe. In this talk, we review the current status of the νDM portal, focusing on how interactions between these sectors could influence the evolution of cosmological perturbations. We specifically highlight the role of resonantly enhanced scattering, demonstrating how these precision effects, localized to specific redshift ranges, significantly alter the matter power spectrum and the interpretation of high-multipole CMB and weak lensing data. We conclude by discussing the prospects for future surveys to test these dark-sector interactions rigorously and to unveil the fundamental properties of the neutrino-DM connection.