Studies of inflation and dark energy with coupled scalar fields

Understand

Currently there is no definitive description for the accelerated expansion of the Universe at both early and late times; we know these two periods as the epochs of inflation and dark energy.

• Contained within this Thesis are two studies of inflation and one in the context of dark energy.
• The first study involves two noncanonical kinetic terms each in a two-field scenario, and their effects on the generation of isocurvature modes.
• As a result, these terms affect the isocurvature perturbations produced, and consequently the Cosmic Microwave Background.