Production of Gravitational Waves from Preheating and Tachyonic Instabilities

Khursid Alam, Koushik Dutta, Ahamadullah Khan

We analyze GW production during preheating for an $\alpha$-attractor potential terminating in the positive-curvature regime, with energy transfer via $\varphi {\chi }^2$. Linear Floquet analysis a…