Quintessence without scalar fields

Details Quintessence without scalar fields Quintessence without scalar fields

2003-03-03

arxiv.org/abs/astro-ph/0303041v1

RecentRes.Dev.Astron.Astrophys.1:625,2003

Astronomy and Astrophysics

Astrophysics

46 pages, 6 figures

Scientific paper

The issues of quintessence and cosmic acceleration can be discussed in the framework of theories which do not include necessarily scalar fields. It is possible to define pressure and energy density for new components considering effective theories derived from fundamental physics like the extended theories of gravity or simply generalizing the state equation of matter. Exact accelerated expanding solutions can be achieved in several schemes: either in models containing higher order curvature and torsion terms or in models where the state equation of matter is corrected by a second order Van der Waals terms. In this review, we present such new approaches and compare them with observations.

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