CMB constraints on interacting cosmological models

Details CMB constraints on interacting cosmological models CMB constraints on interacting cosmological models

2004-02-03

arxiv.org/abs/astro-ph/0402067v1

JCAP 0405 (2004) 009

Astronomy and Astrophysics

Astrophysics

18 pages, 5 encapsulated eps figures, uses revtex4

Scientific paper

10.1088/1475-7516/2004/05/009

Non-canonical scaling of the form $\rho_{x} \propto \rho_{m} a^{\xi}$, where $\rho_{x}$ and $\rho_{m}$ are the energy densities of dark energy and dark matter, respectively, provides a natural way to address the coincidence problem -why the two densities are comparable today. This non-canonical scaling is achieved by a suitable interaction between the dark components. We study the observational constraints imposed on such models from the cosmic microwave background (CMB) anisotropy spectrum. Using the recent WMAP results for the location of the CMB peaks, we determine the admissible parameter space and find that interacting models are well consistent with current observational bounds.

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