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Indexed by:期刊论文

Date of Publication:2013-12-03

Journal:PHYSICAL REVIEW D

Included Journals:SCIE、Scopus

Volume:88

Issue:12

ISSN No.:2470-0010

Abstract:In this paper, we loosen the zero equation of state of dark matter to a constant w(dm). By using the currently available cosmic observations, which include the type-Ia supernovae, the baryon acoustic oscillation, the WiggleZ measurements of matter power spectrum, and the cosmic microwave background radiation from the firs release of Planck data through the Markov chain Monte Carlo method, we found the equation of state of dark matter in 3 sigma regions: w(dm) = 0.000707(-0.00074-0.00149-0.00196)(+0.000746+0.00146+0.00193). The difference between the minimum of chi(2) between the Lambda CDM and Lambda wDM models is Delta chi(2)(min) = 0.446 for one extra model parameter wdm. Although the currently available cosmic observations favor the Lambda wDM mildly, no significant deviation from the Lambda CDM model is found in 1 sigma regions.