Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2005-04-13
Phys.Rev.D72:063505,2005
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
21 pages, LaTeX file, no figures. Replaced version to be published on Phys. Rev. D
Scientific paper
10.1103/PhysRevD.72.063505
The current accelerated universe could be produced by modified gravitational dynamics as it can be seen in particular in its Palatini formulation. We analyze here a specific non-linear gravity-scalar system in the first order Palatini formalism which leads to a FRW cosmology different from the purely metric one. It is shown that the emerging FRW cosmology may lead either to an effective quintessence phase (cosmic speed-up) or to an effective phantom phase. Moreover, the already known gravity assisted dark energy dominance occurs also in the first order formalism. Finally, it is shown that a dynamical theory able to resolve the cosmological constant problem exists also in this formalism, in close parallel with the standard metric formulation.
Allemandi Gianluca
Borowiec Andrzej
Francaviglia Mauro
Odintsov Sergei D.
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