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We exhibit a new instability that leads to "fast" coherentneutrino-antineutrino mixing in a dense neutrino cloud, arising from thestandard four-Fermi interaction induced by Z exchange, and overlooked in thebig existing literature on fast processes in this venue. It can play anessential role in creation of an abundance of pseudoscalar mesons of mass inthe KeV range in the early universe, at temperatures in the range 10-100 MeV.Also it can overpower existing calculations in the "neutrino bulb" regions ofthe supernova cloud.

Neutrino-anti-neutrino instability in dense neutrino systems, with applications to the early universe and to supernovae