A bstract We study a version of Starobinsky-like inflation in no-scale supergravity (SUGRA)
where a Polonyi term in the hidden sector breaks supersymmetry (SUSY) after inflation …

The issue of electroweak vacuum stability is studied in presence of a scalar field which
participates in modifying the minimal chaotic inflation model. It is shown that the threshold …

We show that the seesaw mechanism as well as leptogenesis are natural outcomes of a
viable chaotic inflation in supergravity. The inflation model contains two superfields, the …

We discuss resonant leptogenesis arising from the decays of two nearly-degenerate right-
handed neutrinos, identified as the inflaton and stabiliser superfields in a model of chaotic …

We study if the minimal sneutrino chaotic inflation is consistent with a flavor symmetry of the
Froggatt–Nielsen type, to derive testable predictions on the Dirac and Majorana CP violating …

In this thesis we investigate the different kind of roles, scalar fields can serve in the Universe.
First we analyze the scalar field's role in guiding successful inflation in the early Universe …