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The massive neutron star (NS) or black hole (BH) accretion disk resultingfrom NS--NS or NS--BH mergers is dense in neutrinos. We present the first studyon the role of angular distributions in the neutrino flavor conversion abovethe remnant disk. In particular, we focus on "fast" pairwise conversions whoserate depends on the local angular intensity of the electron lepton numbercarried by neutrinos. Because of the emission geometry and the flux density of$\bar{\nu}_e$ being larger than that of $\nu_e$, fast conversions prove to be ageneric phenomenon in NS--NS and NS--BH mergers for physically motivateddisturbances in the mean field of flavor coherence. Our findings suggest that,differently from the core-collapse supernova case, fast flavor conversions seemto be unavoidable in compact mergers and could have major consequences for thejet dynamics and the synthesis of elements above the remnant disk.

Fast neutrino conversions: Ubiquitous in compact binary merger remnants