PhysRevD.81.043520.pdf (434.74 kB)
Unified dark energy and dark matter from a scalar field different from quintessence
journal contribution
posted on 2023-06-07, 22:22 authored by Changjun Gao, Martin Kunz, Andrew R Liddle, David ParkinsonWe 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.
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- Published
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- Published version
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Physical Review DISSN
1550-7998Publisher
American Physical SocietyExternal DOI
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4Volume
81Department affiliated with
- Physics and Astronomy Publications
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Article Number: 043520Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06First Open Access (FOA) Date
2016-03-22First Compliant Deposit (FCD) Date
2016-11-10Usage metrics
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