Consistent modified gravity: dark energy, acceleration and the absence of cosmic doomsday

Abstract

We discuss the modified gravity which includes negative and positive powers of the curvature and which provides the gravitational dark energy. It is shown that in GR plus the term containing negative power of the curvature the cosmic speed-up may be achieved, while the effective phantom phase (with $w$ less than -1) follows when such term contains the fractional positive power of the curvature. The minimal coupling with matter makes the situation more interesting: even 1/R theory coupled with the usual ideal fliud may describe the (effective phantom) dark energy. The account of $R^2$ term (consistent modified gravity) may help to escape of cosmic doomsday.

LaTeX file, 9 pages, based on the talk given by S.D. Odintsov (Int. Conference Mathematical Methods in Physics, Rio de Janeiro, Augest, 2004), to appear in CQG, Letters

References in corpus (5)

• The final state and thermodynamics of dark energy universe
• Quantum escape of sudden future singularity
• Accelerated Cosmological Models in Ricci squared Gravity
• Newtonian limit of the singular f(R) gravity in the Palatini formalism
• de Sitter attractors in generalized gravity

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• Reconstructing cosmic acceleration from modified and non-minimal gravity: The Yang-Mills case
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