Resonant features in the stochastic gravitational wave background

We analyse the post-inflationary contribution to stochastic gravitational wave background due a resonant feature in scalar power spectrum, which is characterised by an oscillation log(k), complementing our previous work arXiv:2012.02761 on sharp features. Primordial features signal departures of inflation from single-field slow-roll paradigm and are motivated embeddings high energy physics. find that spectrum leads corresponding modulation can be understood as superposition two oscillatory pieces, one with original frequency oscillations, double frequency. For oscillations slowly-varying amplitude this part computed semi-analytically. Our results used templates for reconstruction future data permit extracting information about small scale measurements background.