Stochastic Gravitational-Wave Background from Axion-Monodromy Oscillons in String Theory During Preheating

Understand

Axion monodromy is a generic phenomenon in string compactifications.

• We investigate the production of gravitational-wave background from axion monodromy inflation during preheating.
• By performing lattice simulations using pseudo-spectral methods, we find that significant single-peak stochastic gravitational-wave backgrounds are generated during preheating for asymptotic linear $|\phi|$ and $\phi^{2/3}$ potentials in axion monodromy inflation and cuspy potentials.
• This may allow us to explore string compactifications through gravitational waves.