Gravitational-wave observatories and pulsar timing arrays can constrain primordial curvature perturbations on scales far smaller than the CMB, with projected LISA sensitivity near amplitude A_zeta <= 10^-4.
Scalar Induced Gravitational Waves Review
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Constraining primordial curvature perturbations with present and future GW detectors
Gravitational-wave observatories and pulsar timing arrays can constrain primordial curvature perturbations on scales far smaller than the CMB, with projected LISA sensitivity near amplitude A_zeta <= 10^-4.