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Modified Friedmann equation from nonminimally coupled theories of gravity

2014; American Physical Society; Volume: 89; Issue: 4 Linguagem: Inglês

10.1103/physrevd.89.044012

1550-7998

Orfeu Bertolami, Jorge Páramos,

Solar and Space Plasma Dynamics

In this work we study how nonminimally coupled theories of gravity modify the usual Friedmann equation, and develop two methods to treat these. The ambiguity in the form of the Lagrangian density of a perfect fluid is emphasized, and the impact of different dominant matter species is assessed. The Cosmological Constant problem is also discussed.