Séminaire / Seminar GReCO |
| « Modified Gravity as an Alternative to Dark Matter: A Review » |
|
D. F. Mota |
| A relativistic theory of modified gravity has been recently proposed by Bekenstein. The tensor field in Einstein''s theory of gravity is replaced by a scalar, a vector, and a tensor field which interact in such a way to give Modified Newtonian Dynamics in the weak-field non-relativistic limit. We review the evolution of the universe in such a theory, identifying its key properties and comparing it with the standard cosmology obtained in Einstein gravity. In particular we show that the evolution of the scalar field is akin to that of tracker quintessence fields, and that the vector field plays a fundamental role on large scale structure formation. The impact on galaxy distributions and the cosmic microwave background is also analyzed. |
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lundi 26 mars 2007 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |