Reconstructing Quintom from WMAP 5-year Observations:Generalized Ghost Condensate

【摘要】 <正> In the 5-year WMAP data analysis,a new parametrization form for dark energy equation-of-state was used,and it has been shown that the equation-of-state,w(z),crosses the cosmological-constant boundary w =-1.Based onthis observation,in this paper,we investigate the reconstruction of quintom dark energy model.As a single-real-scalarfieldmodel of dark energy,the generalized ghost condensate model provides us with a successful mechanism for realizingthe quintom-like behavior.Therefore,we reconstruct this scalar-field quintom dark energy model from the WMAP 5-yearobservational results.As a comparison,we also discuss the quintom reconstruction based on other specific dark energyansatzs,such as the CPL parametrization and the holographic dark energy scenarios.更多还原

【Abstract】 In the 5-year WMAP data analysis,a new parametrization form for dark energy equation-of-state was used, and it has been shown that the equation-of-state,w(z),crosses the cosmological-constant boundary w =-1.Based on this observation,in this paper,we investigate the reconstruction of quintom dark energy model.As a single-real-scalarfield model of dark energy,the generalized ghost condensate model provides us with a successful mechanism for realizing the quintom-like behavior.Therefore,we reconstruct this scalar-field quintom dark energy model from the WMAP 5-year observational results.As a comparison,we also discuss the quintom reconstruction based on other specific dark energy ansatzs,such as the CPL parametrization and the holographic dark energy scenarios.更多还原