A growing neutrino mass can stop the dynamical evolution of a dark energy scalar field, thus explaining the why now problem. We show that such models lead to a substantial neutrino clustering on the scales of superclusters. Nonlinear neutrino lumps form at redshift z sim 1 and could partially drag the clustering of dark matter. If observed, large scale non-linear structures could be an indication for a new attractive cosmon force stronger than gravity.
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