Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-12-05
Phys.Rev.D81:043520,2010
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
10 pages RevTeX4 with 5 figures incorporated
Scientific paper
We explore unification of dark matter and dark energy in a theory containing a scalar field of non-Lagrangian type, obtained by direct insertion of a kinetic term into the energy-momentum tensor. This scalar is different from quintessence, having an equation of state between -1 and 0 and a zero sound speed in its rest frame. We solve the equations of motion for an exponential potential via a rewriting as an autonomous system, and demonstrate the observational viability of the scenario, for sufficiently small exponential potential parameter \lambda, by comparison to a compilation of kinematical cosmological data.
Gao Changjun
Kunz Martin
Liddle Andrew R.
Parkinson David
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