Primordial Fluctuations in String Cosmology

Understand

This thesis is dedicated to the study of inflationary scenarios based on string theory.

• Inflation is a brief period of accelerated expansion in the very early Universe which gives natural explanations for problems of the Standard Big Bang Model (SBBM) of cosmology.
• The phenomenological success of inflation provides the motivation for numerous efforts to establish its connection with particle physics.
• As a promising contender for a unified theory at very high energy scales, string theory is an obvious framework to look for the theoretical foundations of inflation; we therefore try to determine the characteristic features of string-inspired inflationary scenarios, along with their observational consequences.