Features in the dark energy equation of state and modulations in the Hubble diagram
作者： Jun-Qing Xia , Gong-Bo Zhao , Hong Li , Bo Feng , Xinmin Zhang
DOI: 10.1103/PHYSREVD.74.083521
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摘要: We probe the time dependence of dark energy equation state (EOS) in light three-year WMAP (WMAP3) and combination with other tentative cosmological observations from galaxy clustering (SDSS) Type Ia Supernova (SNIa). mainly focus on cases where EOS is oscillating or local bumps. By performing a global analysis Markov Chain Monte Carlo (MCMC) method, we find current observations, particular, WMAP3 + SDSS data combination, allow large oscillations which can leave features (residual) Hubble diagram, such are potentially detectable by future like SNAP, even currently ongoing SNIa observations. Local bumps also imprints CMB, LSS SNIa. In take place at low redshifts effective close to -1, CMB cannot give stringent constraints possibilities. However, geometrical (future) possibly detect features. On hand when higher beyond detectability SNIa, precise Gamma-ray bursts, may that bumplike high might be responsible for localized ranges l similar 20-40, interesting deserves addressing further.
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