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Binary neutron star merger (BNSM) offers an environment where fastneutrino-flavor conversion (FFC) can vividly occur, that potentially leads to aconsiderable change of neutrino radiation field. In this Letter, we investigateglobal features of FFC by general relativistic quantum kinetic neutrinotransport simulations in spatial axisymmetry. Our result suggests that globaladvection of neutrinos plays a crucial role in FFC dynamics. Although flavorconversions occur ubiquitously in the early phase, they can be active only in anarrow region in the late phase. This region includes an ELN-XLN Zero Surface(EXZS), corresponding to a surface where electron-neutrinos lepton number (ELN)equals to heavy-leptonic one (XLN). The EXZS is not stationary, but dynamicallyevolve in a time scale of global advection. We also find that neutrinos canundergo a flavor swap when they pass through the EXZS, resulting inqualitatively different neutrino radiation fields between both sides of EXZS.Our result suggests that EXZS is one of the key ingredients to characterize FFCin BNSM.

Global features of fast neutrino-flavor conversion in binary neutron star merger