Scalar-induced gravitational waves from small-scale curvature perturbations can imprint detectable CMB B-mode polarization, giving future experiments a new window on the primordial power spectrum at k ~ 1-10 Mpc^-1.
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From Fluctuation to Polarization: Imprints of $O(1-10)\, \mathrm{Mpc}^{-1}$ Curvature Perturbations in CMB B-modes from Scalar-Induced Gravitational Waves
Scalar-induced gravitational waves from small-scale curvature perturbations can imprint detectable CMB B-mode polarization, giving future experiments a new window on the primordial power spectrum at k ~ 1-10 Mpc^-1.