Transition from a matter-dominated era to a dark energy universe (CROSBI ID 155276)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Nojiri Shin'ichi ; Odintsov, Seregei D. ; Štefančić, Hrvoje
engleski
Transition from a matter-dominated era to a dark energy universe
We develop a general program of the unification of a matter-dominated era with an acceleration epoch for scalar-tensor theory or a dark fluid. The general reconstruction of the scalar-tensor theory is fulfilled. The explicit form of the scalar potential for which the theory admits a matter-dominated era, a transition to an acceleration, and an (asymptotically de Sitter) acceleration epoch consistent with Wilkinson Microwave Anisotropy Probe data is found. The interrelation of the epochs of deceleration-acceleration transition and matter dominance-dark energy transition for dark fluids with a general equation of state (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 a 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.
equation-of-state; scalar-tensor; phantom cosmology; model; fluid; acceleration; potentials; inflation; phase
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Podaci o izdanju
74 (8)
2006.
086009-1-086009-9
objavljeno
1550-7998
0.1103/PhysRevD.74.086009