Early Stages of the Universe

The Early Universe

An introductory account is given of the modern understanding of the physics of the early Universe. Particular emphasis is placed on the paradigm of cosmological inflation, which postulates a period of accelerated expansion during the Universe’s earliest stages. Inflation provides a possible origin for structure in the Universe, such as microwave background anisotropies, galaxies and galaxy clus...

The Very Early Universe

In these lectures we dwell upon the cosmological cornerstones of the Very Early Universe (VEU) theory: Parametric Amplification Effect (PAE) responsible for the generation of Pri

Reionization of the early Universe

Disorder in the early universe

Little is known about the microscopic physics that gave rise to inflation in our universe. There are many reasons to wonder if the underlying description requires a careful arrangement of ingredients or if inflation was the result of an essentially random process. At a technical level, randomness in the microphysics of inflation is closely related to disorder in solids. We develop the formalism...

Glimpses into the early Universe

Inflation is today the main theoretical framework to describe the early Universe. In thirty years of existence, inflation, in contrast with earlier competitors, has survived the confrontation with cosmological data, which have tremendously improved over the years. Indeed, the fluctuations of the Cosmic Microwave Background (CMB) had not yet been measured when inflation was invented, whereas the...