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tokens: We thank the anonymous referee for useful discussions and comments which considerably helped us to improve the manuscript. DK was supported by RFBR grant 13-02-92119 and by the French national research agency ANR (COSMIS project). She thanks the Max-Planck-Institut für Astrophysik for the warm hospitality. SB was supported by RFBR grant 13-02-92119 and SAI MSU. This work was supported by the Deutsche Forschungsgemeinschaft via the Transregional Collaborative Research Center TRR 33 ‘The Dark Universe’ and the Excellence Cluster EXC153 ‘Origin and Structure of the Universe’.