Lensing dispersion of SNIa and small scales of the primordial power spectrum

摘要: Probing the primordial power spectrum at small scales is crucial for discerning inflationary models, especially if BICEP2 results are confirmed. We demonstrate this necessity by briefly reviewing single field models that give a detectable gravitational waves signal, thus being degenerate with large on CMB scales. A distinct prediction of these an enhancement scales, lifting up degeneracy. propose way to detect enhancement, and more generally, different features in $1\lesssim k \lesssim 10^2-10^3 \,\mathrm{Mpc}^{-1}$ considering existing data lensing dispersion Type Ia supernovae. show various deviations from simplest $n_s\simeq 0.96$ cuts considerably into allowed parameter space PLANCK constrains smaller beyond reach other current sets.