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2021

Resonant features in the stochastic gravitational wave background

Fumagalli, Jacopo, Renaux-Petel, Sébastien, Witkowski, Lukas T.

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We analyse the post-inflationary contribution to the stochastic gravitational wave background due to a resonant feature in the scalar power spectrum, which is characterised by an oscillation in $\log(k)$, complementing our previous work arXiv:2012.02761 on sharp features.

Primordial features signal departures of inflation from the single-field slow-roll paradigm and are motivated by embeddings of inflation in high energy physics.
We find that the oscillation in the scalar power spectrum leads to a corresponding modulation in the gravitational wave spectrum that can be understood as a superposition of two oscillatory pieces, one with the original frequency of the scalar oscillations, and one with double frequency.
For oscillations with slowly-varying amplitude this oscillatory part can be computed semi-analytically.

Resonant features in the stochastic gravitational wave background · Around

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