Quintessence dissipative superattractor cosmology

Details Quintessence dissipative superattractor cosmology Quintessence dissipative superattractor cosmology

2001-01-31

arxiv.org/abs/astro-ph/0101549v3

Phys.Rev. D63 (2001) 103508

Astronomy and Astrophysics

Astrophysics

15 pages, Revtex, 2 figures. v3: Minor typos corrected

Scientific paper

10.1103/PhysRevD.63.103508

We investigate the simplest quintessence dissipative dark matter attractor cosmology characterized by a constant quintessence baryotropic index and a power--law expansion. We show a class of accelerated coincidence--solving attractor solutions converging to this asymptotic behavior. Despite its simplicity, such a ``superattractor'' regime provides a model of the recent universe that also exhibits an excellent fit to supernovae luminosity observations and no age conflict. Our best fit gives $\alpha=1.71\pm 0.29$ for the power-law exponent. We calculate for this regime the evolution of density and entropy perturbations.

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