More on gravitational waves from double monodromy inflation

Medeu Abishev, A.Zh. Abylayeva, Andrea Addazi, Yermek Aldabergenov, Daulet Berkimbayev

Physics Letters B, 2022

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DOI 10.1016/j.physletb.2022.137574

Data confidence 70 medium

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Abstract

We further analyze phenomenological implications of double axion monodromy inflation proposed in Ref. (D'Amico et al. [13]), in gravitational wave physics. We show that in addition to chiral gravitational waves (GW) originating from gauge field instability, the model also predicts significant amount of non-chiral, scalar-induced gravitational waves, both peaking at around the same frequencies. We find that although chiral GW density has much larger peak, non-chiral GWs can dominate away from the peak as they decay at a slower rate. This provides an interesting GW signature to be probed by future space-based interferometers such as LISA and DECIGO.