Naslov
Transition from a matter-dominated era to a dark energy universe

Autori
Nojiri Shin'ichi ; Odintsov, Seregei D. ; Štefančić, Hrvoje

Izvornik
Physical Review D - Particles, Fields, Gravitation, and Cosmology (1550-7998) 74 (2006), 8; 086009-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
equation-of-state; scalar-tensor; phantom cosmology; model; fluid; acceleration; potentials; inflation; phase

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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