Strong Lensing Constraints on Small-Scale Linear Power
Neal Dalal, Christopher S. Kochanek
Abstract
We place limits on the linear power spectrum on small scales (k > 50 h/Mpc) using measurements of substructure in gravitational lens galaxies. We find excellent agreement with the simplest LambdaCDM models, and in conjunction with other cosmological probes, place constraints on the neutrino mass mnu, tilt of the primordial power spectrum n, and mass of the dark matter particle m. We find n>0.94, and for a Harrison-Zeldovich spectrum, find mnu<0.74 eV and m>5.2 keV, at 95% confidence.
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