期刊
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
卷 17, 期 8, 页码 1229-1243出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271808012784
关键词
dark energy; sound speed; perturbation; no-go theorem
In this paper we study in detail the sound speed - c(s)(2), which is directly related to the classical perturbations - of dynamical dark energy (DE). We consider especially the case with an equation of state crossing the cosmological constant boundary, and show its implications for cosmic microwave background (CMB) anisotropy. With the present observational data on the CMB, the Type Ia supernova (SNIa) and galaxy clustering, we perform a global analysis to constrain the sound speed of DE, using the Markov chain Monte Carlo method. We find that the sound speed of DE is weakly constrained by current observations, and thus futuristic precision measurements of the CMB on a very large angular scale (low multipoles) are necessary.
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