Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-16
Phys.Rev.D73:083516,2006
Astronomy and Astrophysics
Astrophysics
23 pages, 7 figures
Scientific paper
10.1103/PhysRevD.73.083516
We discuss the evolution of linear perturbations in a quintessence model in which the scalar field is non-minimally coupled to cold dark matter. We consider the effects of this coupling on both cosmic microwave background temperature anisotropies and matter perturbations. Due to the modification of the scale of cold dark matter as $\rho_{c} = \rho_{c}^{(0)} a^{-3 + \xi}$, we can shift the turnover in the matter power spectrum even without changing the present energy densities of matter and radiation. This can be used to constrain the strength of the coupling. We find that the phenomenology of this model is consistent with current observations up to the coupling power $n_{c} \leq 0.01$ while adopting the current parameters measured by WMAP. Upcoming cosmic microwave background observations continuing to focus on resolving the higher peaks may put strong constraints on the strength of the coupling.
Lee Seokcheon
Liu Guo-Chin
Ng Kin-Wang
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