Using recent bounds on light, memory-burdened primordial black holes, this paper derives new upper limits on the curvature power spectrum, roughly P_R < 10^-1.7, for wavenumbers 4.5e18 to 1.8e21 Mpc^-1.
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Constraints on the primordial curvature power spectrum at small scales between $3\times 10^{18}$ and $4.5\times 10^{21}~\rm Mpc^{-1}$
Using recent bounds on light, memory-burdened primordial black holes, this paper derives new upper limits on the curvature power spectrum, roughly P_R < 10^-1.7, for wavenumbers 4.5e18 to 1.8e21 Mpc^-1.