# Fast neutrino conversions: Ubiquitous in compact binary merger remnants

## TL;DR

This paper demonstrates that fast neutrino flavor conversions are a common and unavoidable phenomenon in neutron star merger remnants, potentially impacting jet behavior and element formation.

## Contribution

It provides the first analysis of how angular distributions influence fast neutrino flavor conversions in merger remnants, highlighting their ubiquity.

## Key findings

- Fast conversions are generic in neutron star merger environments.
- Angular distribution significantly affects flavor conversion rates.
- Fast conversions may influence jet dynamics and nucleosynthesis.

## Abstract

The massive neutron star (NS) or black hole (BH) accretion disk resulting from NS--NS or NS--BH mergers is dense in neutrinos. We present the first study on the role of angular distributions in the neutrino flavor conversion above the remnant disk. In particular, we focus on "fast" pairwise conversions whose rate depends on the local angular intensity of the electron lepton number carried 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 a generic phenomenon in NS--NS and NS--BH mergers for physically motivated disturbances in the mean field of flavor coherence. Our findings suggest that, differently from the core-collapse supernova case, fast flavor conversions seem to be unavoidable in compact mergers and could have major consequences for the jet dynamics and the synthesis of elements above the remnant disk.