Statefinder diagnostic for coupled quintessence
By Xin Zhang. 2005
219 citations recorded by the source corpus.
The problem of the cosmic coincidence is a longstanding puzzle. This conundrum may be solved by introducing a coupling between the two dark sectors. In this Letter, we study two cases of the coupled quintessence scenario. (a) Assume that the mass of dark matter particles depends exponentially on the scalar field associated to dark energy and meanwhile the scalar field evolves in an exponential potential; (b) Assume that the mass of dark matter particles depends on a power law function of the scalar field and meanwhile the scalar field evolves in a power law potential. Since the dynamics of this system is dominated by an attractor solution, the mass of dark matter particles is forced to change with time as to ensure that the ratio between the energy densities of dark matter and dark energy becomes a constant at late times, and one thus solve the cosmic coincidence problem naturally. We perform a statefinder diagnostic to both cases of this coupled quintessence scenario. It is shown that the evolving trajectory of this scenario in the s-r diagram is quite different from those of other dark energy models. (c) 2005 Elsevier B.V. All rights reserved.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/7dbfb42a68670e077e12372c6592025dcb1c80ed
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Citations in the corpus
- Constraints on holographic dark energy from the latest supernovae, galaxy clustering, and cosmic microwave background anisotropy observations (2007, background): “Numerous other candidates for dark energy have also been proposed in the literature, such as an evolving canonical scalar field [14, 15, 16, 17, 18, 19] usually referred to as quintessence, the phantom energy [20, 21, 22] with an equation-of-state smaller than −1 violating the weak energy condition,”
- Holographic dark energy (2016, background): “[238, 239, 240, 241], the Statefinder diagnostic can effectively differentiate between a wide variety of DE models.”
- RECONSTRUCTING DARK ENERGY (2006, unknown): “G rav.21,5609 [gr-qc/0411015];X.Zhang,2005, Phys.”