Modified gravity. Problems and observational manifestations

Details Modified gravity. Problems and observational manifestations Modified gravity. Problems and observational manifestations

2012-04-12

arxiv.org/abs/1204.2698v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 4 figures, talk presented at Les Rencontres de Physique de la Vallee d'Aoste, 26 February - 3 March, 2012

Scientific paper

Some models of modified gravity and their observational manifestations are considered. It is shown, that gravitating systems with mass density rising with time evolve to a singular state with infinite curvature scalar. The universe evolution during the radiation dominated epoch is studied in $R^2$-extended gravity theory. Particle production rate by the oscillating curvature is calculated. Possible implications of the model for cosmological creation of non-thermal dark matter are discussed.

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