Speaker
Anjan Giri
Description
Recent observations from ACT along with Planck and DESI give us better understanding of the early universe with cosmic inflation. The spectral index $n_s$, tensor-to-scalar ratio (r), $\omega$ and number of e-folds are inferred. In addition, we also have the late time acceleration expansion possibly attributing to the dark energy. We will consider the Starobinsky model to discuss as a modified gravity framework to account for the inflation and dark energy. Furthermore, Quintessential Inflation idea has been suggested to help explain both early and late time acceleration phenomena. We will discuss both the scenarios, comment on the stochastic gravitational waves background in the context of recent observations and prospects.