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Cosmological imprints of string axions in plateau · Around

2017

Cosmological imprints of string axions in plateau

Soda, Jiro, Urakawa, Yuko

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We initiate a study on various cosmological imprints of string axions whose scalar potentials have plateau regions.

In such cases, we show that a delayed onset of oscillation generically leads to a parametric resonance instability.
In particular, for ultralight axions, the parametric resonance can enhance the power spectrum slightly below the Jeans scale, alleviating the tension with the Lyman $\alpha$ forest observations.
We also argue that a long-lasting resonance can lead to an emission of gravitational waves at the frequency bands which are detectable by gravitational wave interferometers and pulsar timing arrays.

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