Very-High-Frequency Gravitational Waves from Multi-Monodromy Inflation

Abstract

We show that in multi-stage axion monodromy inflation an interruption near the end of the penultimate stage can lead to a spike in the gravitational wave background. These gravitational waves are in the frequency range and with an amplitude accessible to proposed terrestrial detectors such as the Einstein Telescope, Cosmic Explorer, and future Levitated Sensor Detector experiments.

1+20 pages, 6 figures; typos corrected, few comments added; final version published in PRD, https://doi.org/10.1103/q4pv-zj9c

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