Gravitation and cosmology: cosmological perturbations and formation of structures in models of field theory in dark energy and dark matter

• Grant number: 10/02421-5
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: June 01, 2010
• End date: January 31, 2013
• Field of knowledge: Physical Sciences and Mathematics - Physics
• Principal Investigator: Elcio Abdalla
• Grantee: Elisa Gouvêa Mauricio Ferreira
• Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 06/07148-0 - Gravitation and Cosmology: Perturbation, Phenomenology and Exact Results, AP.TEM

Abstract

The General Relativity has been shown to be the most adequate to describe gravitational phenomenon in astrophysical scales. It is successfully applied in a wide class of situations from the description of isolated stars, with typical solar system distances, to the cosmology, wich deals with the largest possible observed distances. In this way, we try to understand the questions involving Einstein's Theory of Gravitation and it's interaction with gravitinos or with neutralinos, with the application of these and of field theories in the cosmological context such as the theory of perturbations and formation of the large scale structures. One of the most important questions in modern cosmology involve the possible existence of a positive cosmological constant in Einstein's equations. The study of this constant goes through the relation between the de Sitter space and a gauge invariant Field Theory in the edge of the universe. The theoretical and observational cosmology, despite of its great advances achieved in the recent years, still faces great challenges. The biggest challenge today is the comprehension of the Dark Matter and the Dark Energy by means of models based in theoretical propositions. We recently proposed an interaction for the Dark Matter and Dark Energy that explains the age of old quasars, something that could not be achieved by the Standard Cosmological Model. We hope for a near future a better understanding of these models in terms of most fundamental properties. (AU)