ИСТИНА

Flavor instabilities in collective oscillations of supernova neutrinos are typically studied using the linear stability analysis, and it is known that such an approach gives quite an adequate picture of neutrino flavor transformations, at least within the so-called single-angle scheme. We demonstrate, however, that once the requirement of spherical or translational symmetry of the solution is dropped, the linear instability stage may give way to a totally different nonlinear one. Moreover, nonlinear instabilities develop patterns with interesting scaling features and have a pronounced effect on the flavor spectra seen by a remote observer.