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Quasi-sterile neutrinos are a natural consequence of dark sectors interactingwith the Standard Model (SM) sector via neutrino- and vector-portals.Essentially, quasi-sterile neutrinos are light dark sector fermions with twogeneric properties: (i) they mix with the active neutrinos of the SM, and (ii)they are charged under a vector mediator that couples feebly to SM matter.Various interesting phenomenological consequences result from this class ofparticles. In this article, we investigate one such consequence: new, beyondthe SM matter effects that can alter in-medium neutrino oscillations. Inparticular, for special windows of energy and matter densities, activeneutrinos can resonantly oscillate into sterile neutrinos. We take advantage ofthis feature to build a quasi-sterile neutrino model that can explain theMiniBooNE and LSND anomalies, while remaining compatible with observations fromlong-baseline reactor- and accelerator-based neutrino experiments. This modelis also likely compatible with the recent results reported by the MicroBooNEcollaboration (albeit we cannot precisely quantify this claim due to a lack ofinformation in MicroBooNE's public data releases to date). Implications forsolar neutrinos and $\nu_e$ disappearance searches are also briefly discussed.

Quasi-Sterile Neutrinos from Dark Sectors I. BSM matter effects in neutrino oscillations and the short-baseline anomalies