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Unified dark energy and dark matter from a scalar field different from quintessence

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 λ, by comparison to a compilation of kinematical cosmological data.

preprint2009arXivOpen access
Changjun GaoMartin KunzAndrew R LiddleDavid Parkinson
astro-ph.CO
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Open access4 authors1 topic
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Changjun GaoMartin KunzAndrew R LiddleDavid Parkinson

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