Cosmological inflation predicts the existence of a stochastic background
of gravitational waves (GW), whose features depend on the model of
inflation under consideration. There exist well motivated frameworks
leading to an enhancement of the primordial GW spectrum at frequency
scales testable with GW experiments, with specific features as parity
violation, anisotropies, and non-Gaussianity. I will explain the
properties of such scenarios, and their distinctive predictions for what
respect GW observables. I will then discuss perspectives for testing
these predictions with future GW experiments.
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