Testing dark energy beyond the cosmological constant barrier
Dec, 2003Citations per year
Abstract: (arXiv)
Although well motivated from theoretical arguments, the cosmological constant \emph{barrier}, i.e., the imposition that the equation-of-state parameter of dark energy () is , seems to introduce bias in the parameter determination from statistical analyses of observational data. In this regard, \emph{phantom} dark energy or \emph{superquintessence} has been proposed in which the usual imposition is relaxed. Here, we study possible observational limits to the \emph{phantom} behavior of the dark energy from recent distance estimates of galaxy clusters obtained from interferometric measurements of the Sunyaev-Zel'dovich effect/X-ray observations, Type Ia supernova data and CMB measurements. We find that there is much \emph{observationally} acceptable parameter space beyond the \emph{barrier}, thus opening the possibility of existence of more exotic forms of energy in the Universe.- 98.65.Cw
- 98.80.Es
- 95.35.+d
- dark energy
- energy: phantom
- galaxy: cluster
- photon: cosmic radiation
- numerical calculations: interpretation of experiments
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