| Issue |
A&A
Volume 529, May 2011
|
|
|---|---|---|
| Article Number | A61 | |
| Number of page(s) | 5 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361/201016204 | |
| Published online | 01 April 2011 | |
Research Note
Observational constraints on interacting dark matter model without dark energy
Department of AstronomyBeijing Normal University, Beijing 100875, PR China
e-mail: zhuzh@bnu.edu.cn; liangn@bnu.edu.cn
Received: 25 November 2010
Accepted: 2 March 2011
Aims. The interacting dark matter (IDM) scenario allows for the acceleration of the Universe without dark energy.
Methods. We constrain the IDM model by using the newly revised observational data including H(z) data and Union2 SNe Ia via the Markov chain Monte Carlo method.
Results. When mimicking the ΛCDM model, we obtain a more stringent upper limit to the effective annihilation term at κC1 ≈ 10-3.4 Gyr-1, and a tighter lower limit to the relevant mass of dark matter particles at Mx ≈ 10-8.6 Gev. When mimicking the wCDM model, we find that the effective equation of state of IDM is consistent with the concordance ΛCDM model and appears to be most consistent with the effective phantom model with a constant EoS for which w < −1.
Key words: dark matter / cosmology: observations
© ESO, 2011
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