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Gary Steigman | Ohio State University - United States

Grant number: 08/54757-7
Support type:Research Grants - Visiting Researcher Grant - International
Duration: September 01, 2008 - December 31, 2008
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
Principal Investigator:Jose Ademir Sales de Lima
Grantee:Jose Ademir Sales de Lima
Visiting researcher: Gary Steigman
Visiting researcher institution: Ohio State University, Columbus, United States
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:04/13668-0 - Cosmology in the era of precision: dark energy, dark matter and background cosmic radiation, AP.TEM


The aim of our project is to utilize the observational constraints provided by the temperature anisotropy fluctuation spectrum from CMB and Big-Bang Nucleosynthesis (BBN) to probe the viability of the class of models which connect the universal Dark Matter to the universal Dark Energy. Our research is focused on models where the energy transfer between dark matter and dark energy occurs over cosmological time. In these models, at this epoch, the matter density may differ significantly from that predicted by the standard model, thereby leading to observable effects on the CMB temperature fluctuation power spectrum. The possible influence on the BBN predictions of light element abundances, the related observational constraints, as well as the consistency with the CMB observations are also important to be investigated. Such effects will be exploited to place more severe constraints on this class of models, eliminating those that fail these tests. (AU)