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We investigate the primordial curvature perturbation by the observation ofdark matter substructure. Assuming a bump in the spectrum of the curvatureperturbation in the wavenumber of k>1 Mpc^{-1}, we track the evolution of thehost halo and subhalos in a semi-analytic way. Taking into account possibleuncertainties in the evaluation of the tidal stripping effect on the subhalogrowth, we find a new robust bound on the curvature perturbation with a bumpfrom the number of observed dwarf spheroidal galaxies in our Galaxy and theobservations of the stellar stream. The upper limit on the amplitude of thebump is O(10^{-7}) for k~10^3 Mpc^{-1}. Furthermore we find the boost factor,which is crucial for the indirect detection of dark matter signals, is up toO(10^4) due to the bump that is allowed in the current observational bounds.

Constraining the primordial curvature perturbation using dark matter substructure