Axion-Sourced Gravitational Waves in $\mathrm{B}-\mathrm{L}$ Hybrid Inflation

Ahmed Ayad, Shaaban Khalil

Minimal supersymmetric $\mathrm{B}-\mathrm{L}$ hybrid inflation predicts a negligible vacuum tensor-to-scalar ratio $r_{\mathrm{vac}}\sim 10^{-8}$ due to its extremely flat potential. In thi…