k-inflation: Non-separable case meets ACT measurements

Tahere Fallahi Serish, Seyed Ali Hosseini Mansoori, Fereshteh Felegary +2

We investigate a non-separable subset of $k$-essence in which the kinetic and potential sectors interact through an $X^{\rho }V(\varphi )$ coupling, implemented via a potential-dependent prefac…