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We show that the finite time type II blow up solutions for the energy critical nonlinear wave equation [ \Box u = -u^5 ] on constructed in [28], [27] are stable along a co-dimension three manifold of radial data perturbations in a suitable topology, provided the scaling parameter is sufficiently close to the self-similar rate, i. e. is sufficiently small. Our method is based on Fourier techniques adapted to time dependent wave operators of the form [ -\partial_t^2 + \partial_r^2 + \frac2r\partial_r +V(\lambda(t)r) ] for suitable monotone scaling parameters and potentials with a resonance at zero.
Fabio Nobile, Eleonora Musharbash, Eva Vidlicková