Nature of Dark Matter

Ascertain the fundamental nature and particle identity of dark matter consistent with astrophysical and cosmological observations.

Background

Multiple lines of evidence support the existence of dark matter, yet its particle nature is unknown. Many candidates are proposed, including ultralight scalar (wave-like) dark matter with distinctive cosmological and laboratory signatures.

This work studies a scenario where an ultralight scalar couples to sterile neutrinos, affecting the evolution and potential detection of the cosmic neutrino background. Although such analyses probe specific models and parameter spaces, the overarching question—what dark matter is—remains open.