In the field of cooling flows in clusters of galaxies, Soker developed a model that accounted for the observational problem that clusters are hotter than anticipated by theory. There was a lack of the large amount of cool gas predicted by models. Soker suggested a "cold feedback" scenario, where nonlinear over-dense blobs of gas cool quickly and are removed from the intracluster medium before the next major active galactic nucleus heating event in their region.