Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-08-24
Phys.Rev.D74:086009,2006
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX 12 pages, 1 figure, extended version to appear in PRD
Scientific paper
10.1103/PhysRevD.74.086009
We develop the general program of the unification of matter-dominated era with acceleration epoch for scalar-tensor theory or dark fluid. The general reconstruction of single scalar-tensor theory is fulfilled. The explicit form of scalar potential for which the theory admits matter-dominated era, transition to acceleration and (asymptotically deSitter) acceleration epoch consistent with WMAP data is found. The interrelation of the epochs of deceleration-acceleration transition and matter dominance-dark energy transition for dark fluids with general EOS is investigated. We give several examples of such models with explicit EOS (using redshift parametrization) where matter-dark energy domination transition may precede the deceleration-acceleration transition. As some by-product, the reconstruction scheme is applied to scalar-tensor theory to define the scalar potentials which may produce the dark matter effect. The obtained modification of Newton potential may explain the rotation curves of galaxies.
Nojiri Shin'ichi
Odintsov Sergei D.
Stefancic Hrvoje
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