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Small scale clustering of late forming dark matter

The model largely satises highredshift matter power spectrum constraints from Lyman- forest measurements, while it predicts suppressed abundance of low-mass halos ( 10 9 10 10 h 1 M ) at all redshifts compared to a vanilla CDM model. The analysis of the LFDM halo velocity function shows a better agreement than the CDM prediction with the observed abundance of low-velocity galaxies in the local volume. Halos with mass M & 10 11 h 1 M show minor departures of the density proles from CDM expectations, while smaller-mass halos are less dense, consistent with the fact that they form later than their CDM counterparts.