It is commonly assumed that the energy density of the Universe was dominated by radiation
between reheating after inflation and the onset of matter domination 54,000 years later …

A bstract We study the post-inflationary dynamics for reheating and freeze-in dark matter in
the Higgs-R 2 inflation model. Taking the perturbative approach for reheating, we determine …

We present a new class of two-field inflationary attractor models, known as shift-symmetric
orbital inflation, whose behavior is strongly multifield but whose predictions are remarkably …

We construct models of inflation with many randomly interacting fields and use these to
study the generation of cosmological observables. We model the potentials as multi …

A bstract In this work we propose a statistical approach to handling sources of theoretical
uncertainty in string theory models of inflation. By viewing a model of inflation as a …

We study multi-field inflation in random potentials generated via a non-equilibrium random
matrix theory process. We make a novel modification of the process to include correlations …

In the inflationary framework of cosmology the initial phase of rapid expansion has to be
followed by a reheating stage, which is envisioned to end in a radiation dominated big bang …

In this work, we study the cosmological dynamics of the early universe by employing a small
field potential in the context of multifield inflation. By investigating analytically the …

In this PhD thesis we take smalls steps towards linking our knowledge of the Early Universe
with our knowledge of particle physics. Chapters 3, 4 and 5 deal with Higgs inflation UV …

It is generally assumed that scalar field dark matter halos would contain solitonic cores--
spherically symmetric ground state configurations--at their centers. This is especially …