Curvature Quintessence

Details Curvature Quintessence Curvature Quintessence

2002-01-10

arxiv.org/abs/gr-qc/0201033v1

Int.J.Mod.Phys.D11:483-492,2002

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, LATEX files, to appear on IJMPD

Scientific paper

10.1142/S0218271802002025

The issues of quintessence and cosmic acceleration can be discussed in the framework of higher order theories of gravity. We can define effective pressure and energy density directly connected to the Ricci scalar of curvature of a generic fourth order theory and then ask for the conditions to get an accelerated expansion. Exact accelerated expanding solutions can be achieved for several fourth order theories so that we get an alternative scheme to the standard quintessence scalar field, minimally coupled to gravity, usually adopted. We discuss also conformal transformations in order to see the links of quintessence between the Jordan and Einstein frames.

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